def is_c(s: str) -> bool:
    return s == "c"

def is_w(w: str) -> bool:
    return w == "w"

def is_cww(start_flag: bool, w_count: int) -> bool:
    return w_count == 2 and start_flag

def main():
    S = input()
    ans = -1
    start_flag = False
    tmp = 0
    w_count = 0
    for s in S:
        if is_c(s):
            start_flag = True
            tmp += 1
            continue
        if not start_flag:
            continue
        tmp += 1
        if is_w(s):
            w_count += 1
            if is_cww(start_flag, w_count):
                ans = max(ans, tmp)
                start_flag = False
                tmp = 0
            continue
    print(ans)

if __name__ == "__main__":
    main()