#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)

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

    int n = S.size();
    rep(i, 0, n){
        if(i < n-1 && S[i] == S[i+1]) continue;
        cout << S[i];
    }
    cout << endl;

    return 0;
}