#include<algorithm>
#include<iostream>
#include<string>
#define rep(i,a) for(int i=0;i<(a);++i)
#define repd(i,a) for(int i=(a);i>=0;--i)

const int MAX_N = 50;
const std::string S[] = { "ne", "ushi", "tora", "u", "tatsu", "mi", "uma", "hitsuji", "saru", "tori", "inu", "i" };

int N;
int cnt[12];

int main()
{
	std::cin >> N;
	rep( i, N )
	{
		std::string A;
		std::cin >> A;

		++cnt[std::find( S, S+12, A )-S];
	}

	std::sort( cnt, cnt+12 );

	int t = 0;
	repd( i, 11 )
	{
		t = cnt[i];

		bool fl = false;
		while( i > 0 && t > 1 )
			--i, t -= cnt[i], fl = true;

		if( fl )
			++i;

		if( t > 1 )
		{
			std::cout << "NO" << std::endl;
	
			return 0;
		}
	}

	std::cout << "YES" << std::endl;

	return 0;
}