with open("input") as f:
    start_number = f.readline().strip()

# start_number = "211"

print("Start:", start_number)


def generate_next_number(number):
    next_number = ""
    last_char = ""
    char_count = 0

    for char in number:
        # initialize
        if not last_char:
            last_char = char
            char_count = 1
            continue

        # same as last char: increase count
        if char == last_char:
            char_count += 1
            continue

        # different than last char: append to next_number and initialize
        next_number = next_number + str(char_count) + last_char
        char_count = 1
        last_char = char

    next_number = next_number + str(char_count) + last_char
    return next_number


for i in range(40):
    print("Iteration:", i + 1)
    prev_number = start_number
    start_number = generate_next_number(start_number)
    # print(f"{prev_number} -> {start_number}")

print("Solution:")
print(len(start_number))