#include <bits/stdc++.h>
// #include <atcoder/dsu>
// #include <atcoder/modint>
using namespace std;
// using namespace atcoder;
#define SZ(x) (int)(x).size()
#define dout(x) printf("%.10f\n", (double)(x))
#define ALL(s) (s).begin(), (s).end()
#define so(V) sort(ALL(V))
#define rev(V) reverse(ALL(V))
typedef pair<int, int> P;
typedef pair<long, long> Pl;
typedef vector<vector<int>> vvi;
typedef vector<vector<long>> vvl;

int main()
{
    string N;
    cin >> N;
    if (N[0] == N[1] && N[1] != N[2])
    {
        cout << "Yes" << endl;
    }
    else
    {
        cout << "No" << endl;
    }

        return 0;
}