import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
INF = 2**63-1
mod = 998244353

s = list(input())

y = list("yukicoder")
t = y[::]
now = 0

for i in range(len(s)):
    
    for j in range(len(s) - len(t) + 1):
        for k in range(len(t)):
            if t[k] != s[j + k]:
                break
        else:
            now += 1
            for v in y:
                t.append(v)
            break
    else:
        break
print(now)