#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int INF = (1<<30)-1;
const ll LINF = (1LL<<60)-1;

#define rep(i, n) for (int i = 0; i < n; i++)
#define sz(a) (int)(a.size())

template<class T> 
bool chmax(T &a, T b) {if (a < b) {a = b;return true;}else return false;}

template<class T> 
bool chmin(T &a, T b) {if (a > b) {a = b;return true;}else return false;}

//コーナーケースに気をつけろ！
int main() {
    string s;   cin >> s;
    if (s.size() == 2)
        cout << "Yes" << endl;
    else 
        cout << "No" << endl;
    return 0;   
}

//小数点精度
//cout << fixed << std::setprecision(15) << y << endl;