S = input()
yc = "yukicoder"
cur = 0
K = 0
ans = 0
while cur < len(S):
    if S[cur:cur+len(yc)] == yc:
        K += 1
        cur += len(yc)
    else:
        if K > ans:
            ans = K
        K = 0
        cur += 1
if K > ans:
    ans = K
print(ans)
"🐬"