#include <bits/stdc++.h>
using namespace std;

#define rep(i, n) for (int i = 0; i < (n); i++)
using ll = unsigned long long;
using Graph = vector<vector<int>>;

int main()
{
    string s;
    cin >> s;
    bool yes = 1;

    char hitomozi = s.at(0);

    if (!(s.at(1) == hitomozi))
    {
        yes = 0;
    }
    if (s.at(2) == hitomozi)
    {
        yes = 0;
    }
    if (yes)
    {
        cout << "Yes" << endl;
    }
    else
    {
        cout << "No" << endl;
    }
}