#include "bits/stdc++.h"

using namespace std;
using ll = long long;

void Main() {
    string N;
    cin >> N;
    cout << (N.size() == 2 ? "Yes" : "No") << endl;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    std::cout << std::fixed << std::setprecision(15);
    Main();
    return 0;
}