import sys

sys.setrecursionlimit(10 ** 7)
input = sys.stdin.readline
f_inf = float('inf')
MOD = 10 ** 9 + 7


def solve():
    S = list(input().rstrip())
    T = list("kyoprotenkei90")

    print("Yes" if sorted(S) == sorted(T) else "No")


if __name__ == '__main__':
    solve()