s = input()
t = s.replace('yukicoder','!')
n = len(t)


flag = False
ans = []
cnt = 0

#print(t)

for i in range(n):
    if flag == False:
        if t[i] == "!":
            flag = True
            cnt += 1
    else:
        if t[i] == "!":
            cnt += 1
        else:
            ans.append(cnt)
            cnt = 0
            flag = False
         
ans.append(cnt)   
print(max(ans))