#include <stdio.h>
#include <string.h>

int main(void){
	char p[15] = "kyoprotenkei90";
	
	char str[15];
	scanf("%s",str);
	int len = strlen(str);
	
	for(int i = 0;i < len;i ++){
		int count = 0;
		for(int j = 0;j < len;j ++){
			if(p[i] == str[j]){
				count++;
				str[j] = '\0';
				break;
			}
		}
		if(count == 0){
			printf("No");
			return 0;
		}
	}
	printf("Yes");
}