mod = 1000000007
eps = 10**-9


def main():
    import sys
    from math import floor, sqrt
    input = sys.stdin.readline

    S = sorted(list(input().rstrip('\n')))
    if S == sorted(list("kyoprotenkei90")):
        print("Yes")
    else:
        print("No")


if __name__ == '__main__':
    main()