#include "bits/stdc++.h"
#define int long long

using namespace std;
using ll = long long;
using P = pair<ll, ll>;
const ll INF = (1LL << 61);
ll mod = 1000000007;


signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N; cin >> N;
	string s = to_string(N);
	if (s.size() == 2)cout << "Yes" << endl;
	else cout << "No" << endl;
	return 0;


}