Submission #3441999

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Source Code Expand

//disco2017_a.cpp
//Sat Oct 20 22:59:31 2018

#include <iostream>
#include <string>
#include <queue>
#include <unordered_map>
#include <vector>
#include <algorithm>
#include <math.h>
#define INTINF 2147483647
#define LLINF 9223372036854775807
using namespace std;
using ll=long long;
typedef pair<int,int> P;

int main(){
	string s;
	cin >> s;

	if (s[0] == s[1] && s[1] != s[2] && s[2] == s[3]){
		cout << "Yes" << endl;
	}else {
		cout << "No" << endl;
	}
}

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