def read_input(filename):
    sheet = []
    for line in open(filename).read().splitlines():
        sheet.append(list(line))
    return sheet

# filename = "day07/example_input" # 21
filename = "day07/input" # 1560
sheet = read_input(filename)

splits = 0
for y in range(0,len(sheet)-1): # skip last line
    for x in range(0,len(sheet[y])):
        if sheet[y][x] == "S" or sheet[y][x] == "|":
            # Shoot ray down
            if sheet[y+1][x] == "^": # split
                sheet[y+1][x+1] = "|"
                sheet[y+1][x-1] = "|"
                splits += 1
            else:
                sheet[y+1][x] = "|"



print(f"Total number of splits: {splits}")