#include <iostream>
#include <string>
#include <algorithm>
#include <functional>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <cstdio>
#include <cmath>
#include <tuple>
#define int long long
#define rep(i, n) for(i = 0; i < n; i++)
using namespace std;

signed main() {
	int n;
	cin >> n;
	if (10 <= n && n <= 99) cout << "Yes" << endl;
	else cout << "No" << endl;
	return 0;
}