def foo(S):
    """
    文字列 S を適切に並び替えることで、文字列 kyoprotenkei90 を作ることができますか？
    """

    S_list = list(S)
    try:
        assert S_list.count('k') == 2, None
        assert S_list.count('y') == 1, None
        assert S_list.count('o') == 2, None
        assert S_list.count('p') == 1, None
        assert S_list.count('r') == 1, None
        assert S_list.count('t') == 1, None
        assert S_list.count('e') == 2, None
        assert S_list.count('n') == 1, None
        assert S_list.count('i') == 1, None
        assert S_list.count('9') == 1, None
        assert S_list.count('0') == 1, None
    except AssertionError:
        return 'No'
    return 'Yes'


if __name__ == '__main__':
    S = input()
    print(foo(S))