#include<iostream>
#include<algorithm>
#include<string>
#include<math.h>
#include<bitset>
#include <vector>
#include<bitset>
#include <iomanip>
#include <map>
#include <set>
#include <stack>
#include <deque>
#include <climits>
#include <queue>
using namespace std;


int main() {
	
	
	string S;
	cin >> S;
	int N = S.size();
	for (int i = 0; i < N; i++) {
		if (S[i] != S[i + 1])cout << S[i];
	}


	
}