#include<stdio.h>
#include<string.h>
#include<algorithm>
int num[12];
main(){
    int N;
    scanf("%d",&N);
    char str[12][8] = {"ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"};
    for(int i = 0;i < N;i++){
        char S[8];
        scanf("%s",S);
        for(int j = 0;j < 12;j++){
            if(!strcmp(S,str[j]))num[j]++;
        }
    }
    std::sort(num,num+12);
    printf("%s\n",N/2+N%2>=num[11]?"YES":"NO");
}