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

void main(void){
    const char eto[12][10] = {"ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"};
	int etoList[12] = {0,0,0,0,0,0,0,0,0,0,0,0,0};
    char str[100] = "a";
    int n = 0;
	scanf("%d",&n);
	for(int i = 0 ; i < n ;i++){
		scanf("%s",str);
        for(int j = 0 ; j < 12 ; j++){
            if(strcmp(eto[j],str) == 0){
                etoList[j]++;
                break;
            }
        }
	}
    bool orderFlg = true;
    for(int i = 0 ; i < 12 ;i++){
        if(n/2+1 < etoList[i]){
            orderFlg = false;
        }
    }
    if(orderFlg){
        printf("YES");
    }else{
        printf("NO");
    }

}