Envío 3470

Código

def string_edge(s):
    next_index = 1
    size = 1

    while True:
        current_index = 0
        next_index = s.find(s[0], next_index)

        if next_index == -1:
            return 0

        while True:
            current_index += 1
            next_index += 1

            if next_index == len(s):
                return size

            if s[current_index] == s[next_index]:
                size += 1
            else:
                size = 1
                break

s = input()
print(string_edge(s))