#include <bits/stdc++.h>
using namespace std;
int main(void){
    string s;
    cin >> s;
    int N = s.length();
    for( int i = 0; i < N-1; i++ ) {
        if( s[i] != s[i+1] ) cout << s[i];
    }
    cout << s[N-1] << endl;
}