s = input()
n = len(s)
prev = -1
ans = 0
now = 0
for i in range(n-8):
  if s[i:i+9] == "yukicoder":
    if prev == i - 9:
      now += 1
    else:
      now = 1
    ans = max(ans, now)
    prev = i
print(ans)