s = input()

moji = "kyoprotenkei90"

ans = [0]*14

for i in range(14):
    for j in range(14):
        if s[i] == moji[j]:
            ans[j] += 1
            break

crt = [2,1,2,1,1,0,1,2,1,0,0,1,1,1]

if ans == crt:
    print("Yes")
else:
    print("No")