#include <bits/stdc++.h>
#define rep(i, l, r) for (int i = (l); i < (r); i++)
using namespace std;

typedef long long ll;

int main() {
    int N;
    cin >> N;
    if (N > 9 && N < 100) cout << "Yes" << endl;
    else cout << "No" << endl;
}