#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(void){
    int N;
    char A[50][8];
    char eto[12][8] = {"ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"};
    int count[12] = {0};
    int max = 0;
    //  check ok
    //  printf("%s\n",eto[10]);

    scanf("%d",&N);
    //  count
    //  compare
    for(int i = 0; i < N; i++){
        scanf("%s",A[i]);
        for(int j = 0; j < 12; j++){
            if( strcmp(A[i],eto[j]) == 0 ){
                count[j]++;
                break;
            }
        }
    }

    for(int k = 0; k < 12; k++){
        if(max < count[k]){
            max = count[k];
        }
    }

    if(N % 2 != 0){
        N = N / 2 + 1;
    }else{
        N = N / 2;
    }

    if(max > N){
        printf("NO\n");
    }else{
        printf("YES\n");
    }

    return 0;
}