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

int main(){
	string S;
  	bool ans = false;
  	cin >> S;
  	for(int i = 0; i < 1; i++){
    if(S.at(i) == S.at(i + 1) && S.at(i + 1) != S.at(i + 2)){
    ans = true;
    }
    
    if(ans) cout << "Yes" << endl; else cout << "No" << endl;
    }
}