day-3.1.py

iinput = ["....#..#.......#........#....#.", "..##.#.#.#...................#.", "....#.#.##..#....#......#......", ".........#.#......##.....#.....", "..........#.###.##...##........", "#....#.#.......##.....#..#.....", "#...........#.#...#..#..##.##..", "......##.............#.....#...", "..##..........###..#.#..##.....", "...........#........#......##..", "..##...........##..............", "..#......###.#.....#.#.#.......", "..#..#..#..........#.#....#....", ".#.....##......................", "...#...##..#...#.........#..##.", ".#......#..#..#...#......#.##..", "..##.##.......#..#.....#..#...#", "..............#..#..#...#......", "...#...#....##.....#...#...#...", "......................#...#....", ".......#......#...#..##...#.#..", "##......#..#.....#....#.....#..", "....#.#.##.#.#....#............", "#.....##.............#.........", "..........#...........#.#.....#", "...#...##....#.#........#..#...", "................#..#.##.##....#", "......#...#...##...##....#.....", 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"........#.................#....", "#..###.....#.......##.#......##", "....#.#..............#.........", "#..........#.....#..##...#.....", "................#...#..#....#..", "..#...#....##..........#.#.....", "......#........##......#..#...#", "...#....#..#.....#.......#...#.", ".#.....#..#...#..###....#......", "....#.........#....#.#.#.....#.", "#.#....#...#....#.....#..##....", ".......#..#..#..........#...#..", "..#.#..#.....##.#.#............", "..#....#.....#..##..#..#.#..#..", "..#.##.#...........#...#..#....", ".........#........#...#........", "..#.#.#.......##.........#.##..", "#.#..........#.#...#..#......##", ".#..#....................#.#...", ".##......#................#...#", "..##.#######......#....#.......", "....#...##.#....#.#............", ".##....#...##.......#...#..#...", "...........#...#...#...#..#....", "#...#.....#.......#....#.....#.", ".............#.................", "........#.#.......#...#.#.#....", "..............#............#.#.", "......#......##..#.......#....#", "##...#..................#......", ".....#......###.....#.......#.#", ".....#.#............#.#........", "..#.#..#............#....#.#...", "##.#.###.#.#.#..#......#.......", "...##........#..#.....#.#.#..#.", "##......#.##.....####..#.......", "............#...#..#...#..#....", "...#..#................##.#..#.", ".#....#.#...........##.#.#...#.", "####..#...........#.......###..", ".......#.................#.....", ".......#....#.......##....#....", "..#.........#...#....#.........", "..........#..#...#.#...##..#...", "....##..........#.........##...", "#.........##..#.#..#.......#...", ".#...........#....#...#...#.#..", "....#..#.....#...##....#.#....#", ".#....#.....#......#..##.##.#.#", "#......#..#.......##...........", "...#..#...#.#.................#", "......#.......##....##.#......#", "....#....#.#.#.....#....#....#.", "..#..........#.##...##..#......", "...#..#........#....#.#..#....#", "##.......#........#..........#.", 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"..#..#.........#..##.#..#.#...#", ".....#.#.....#.#.......#.....#.", "..................#..#....#.#..", "..#.....###.##.......##....#.#.", "..#......##.......#....##.#....", "....#...................#..##.#", ".......#....#.##.#.......#....#", "..#...#......#..#...###....#.#.", "..#..#.#....#...........#.....#", ".....#..#..#.......#........#..", "......#.##.#......#...........#", "#...#....#.#..##.##..#..##.....", "#...##....#.#...##........#....", "..##............#.#.#..........", "....#.....#.#..#.......#..#....", "#..#.#.....#..#..##...#..##....", "...##........#...........#...#.", ".####......#..##.........#.#...", ".......#.......................", ".................#....#..#.....", ".........##......###...........", ".##......#.#.#....#.#...#..###.", "....#......##.###.#.#..#.......", "..........#.......##......##..#", "...........#.......#..##.......", ".....###..#..............##....", "........##..#.#.#......#....#..", "#....#.........................", "...........#...............##..", "......#.................#......", ".....#...#..##...##...#...#....", "..........#.#...##.####......#.", "..#.#.....##....#...........#..", "..........#....#..#....##...#..", ".#.......#..##...#...#.....#...", "...##....#.#......##...##....#.", "#.......#.......#.##.#...#.#...", "#...#..................#......#", "..#.......#...............#..##", "#.....#..................#....#", ".##.....#.....#......####.....#", "..#........#...#.#........#...#", "..##.....#....#...#...........#", "..#..#.....##..#.##...#........", "..........###..#....##.....#...", "...#...#....#.##.#...#.#.......", "..##......#.......#.......##...", "............#............#.....", ".##....#.........#.............", "....#....#....#........##...#.#", ".......##......................", "..........#.#.................#", "......##.#...#.........#.....#.", "..#...#......#..#.............#", "..........###.#..#.#...#..#..#.", "#..#.#..#....##...#...#.#...#..", ".#........##...#......#.##.....", "...###.#...##..............##..", "#.#.#...#...#..#....#.#..#.....", ".#.#.##..#....#......#.#.......", "...#..#.#....##...........#..#.", ".....##..##......#.#...........", "......#.....#....####....#.....", ".#.#.#...#..#..#...........#...", ".....#......................#..", ".........#.........#.###.##....", ".....#......##..........#......", "..#...........##...........#...", "..............#.........#.....#", "..#....#..#...#...##.#.........", ".#.#.#....#..........#........."]

size = len(iinput[0])
rows = len(iinput)

trees = 0
currentRow = 0
currentCol = 0
while currentRow < rows - 1:
  currentCol = (currentCol + 3) % size
  currentRow += 1
  if iinput[currentRow][currentCol] == "#":
    trees += 1

print(trees)