#include <bits/stdc++.h>
//#include <atcoder/modint>
using namespace std;
//using namespace atcoder;
//using mint = modint1000000007;
typedef long long ll;
#define FOR(I,A,B) for(ll I = ll(A); I < ll(B); ++I)
ll keta_(ll a){ll r=0;while(a){a/=10;r++;}return r;}



int main(){
	int N;
	cin >> N;
	if( 10 <= N && N <= 99){
		cout << "Yes" << endl;
	}else{
		cout << "No" << endl;
	}


}