import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
s = input()
i = 0
r = 0
ans = 0
while i < len(s):
    if s[i:i+9] == "yukicoder":
        i += 9
        r += 1
        ans = max(ans, r)
    else:
        r = 0
        i +=  1

print(ans)