def solv(s: str) -> int:
    count = 0
    cnt = 0
    x = "yukicoder"
    i = 0
    while i < len(s):
        if s[i:i+9] == x:
            count += 1
            i += 9
        else:
            cnt = max(cnt, count)
            count = 0
            i += 1
    return max(cnt, count)


print(solv(input()))