import re

def operate(operator,a,b):

    if operator == "*":
        return int(a) * int(b)
    if operator == "+":
        return int(a) + int(b)

    return None

def read_input(filename):

    sheet = []
    for line in open(filename).read().splitlines():

        line = re.sub('\s{2,}', ' ', line.strip()) # remove multiple spaces with a single one for correct splitting
        row =  line.split(" ")
        sheet.append(row)

    return sheet

# filename = "day06/example_input" # 4277556
filename = "day06/input" # 4719804927602
sheet = read_input(filename)

total = 0
for col in range(0,len(sheet[0])):

    operator = sheet[-1][col]
    row_res = sheet[0][col]
    for row in range(1, len(sheet)-1):
        row_res = operate(operator,row_res,sheet[row][col])

    total += row_res


print(f"Total of sheet operations: {total}")