s = input()

y = "yukicoder"
maxy = 0
cnt = 1
for i in range(len(s)- len(y) +1):
    if s[i:i+9] == y and s[i+9:i+18] == y:
        cnt += 1
        maxy = max(maxy, cnt)
    elif s[i:i+9] == y and s[i+9:i+18] != y:
        cnt = 1
    
print(maxy)