#include <stdio.h>
#include <stdbool.h>

void main(void){
    char sample[] = "kyoprotenkei90";
    char str[20] = "a";
    scanf("%s",str);
    bool tenkei90Flg = true;
    for(int i = 0 ; i < 14 ; i++){
        bool changeFlg = false;
        for(int j = 0 ; j < 14 ; j++ ){
            if(str[i] == sample[j]){
                changeFlg = true;
                sample[j] = 'A';
                break;
            }
        }
        if(!changeFlg){
            tenkei90Flg = false;
            break;
        }
    }
    if(tenkei90Flg){
        printf("Yes");
    }else{
        printf("No");
    }
}