S = input()
N = len(S)

def RLE(A):
    ans = []
    cnt = 0
    for i in range(len(A)):
        cnt += 1
        if i+1 == len(A) or A[i] != A[i+1]:
            ans.append((A[i], cnt))
            cnt = 0
    return ans

def RLER(A):
    ans = []
    for s, c in A:
        ans.append(s*c)
    return "".join(ans)

ans = []
idx = 0
while idx < N:
    if idx+9 <= N and S[idx:idx+9] == "yukicoder":
        ans.append("#")
        idx += 9
    else:
        ans.append(".")
        idx += 1

R = RLE(ans)

MAX = 0
for n, c in R:
    if n == "#":
        MAX = max(MAX, c)

print(MAX)