#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (int)n; i++)
using namespace std;
using ll = long long;

int main() {
    int n;
    cin >> n;
    if (n >= 10 && n < 100) cout << "Yes" << endl;
    else cout << "No" << endl;
}