#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin>>s;
    vector<char> q;
    q.emplace_back(s[0]);
    for(auto a:s){
        if(a==q.back()) continue;
        else q.emplace_back(a);
    }
    for(auto a:q) cout<<a;
    cout<<endl;
}