#include<stdio.h>
#define num 15
int main(void) {
	int count = 0, check;
	char A[num] = "kyoprotenkei90", S[num];
	int N[num];
	scanf("%s", S);
	for (int i = 0; i < num; i++) {
		for (int j = 0; j < num; j++) {
			check = 1;
			if (A[i] == S[j]) {
				for (int k = 0; k < count; k++) {
					if (j == N[k]) {
						check = 0;
					}
				}
				if (check) {
					N[count++] = j;
					break;
				}
			}
		}
	}
	if (count == num) {
		printf("Yes\n");
	}else {
		printf("No\n");
	}
}