s = input()

y = "yukicoder"
maxy = 0
cnt = 0
i = 0
while i < len(s):
    if i < len(s) - 8 and s[i:i+9] == y:
        cnt += 1
        maxy = max(maxy, cnt)
        i += 9
    else:
        cnt = 0
        i += 1
     
print(maxy)