#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  string s,t="";cin>>s;
  rep(i,s.length()){
    if(s[i]==s[i+1])continue;
    else t+=s[i];
  }
  cout<<t<<endl;
}