#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;
 
#include<bits/stdc++.h>
using namespace std;

int main(){
  string s;
  cin>>s;
  vector<char> A;
  int n=s.size();
  rep(i,n){
    if(i==0) A.push_back(s[i]);
    else{
      if(s[i]!=A.back()) A.push_back(s[i]);
    }
  }
  rep(i,(int)A.size()) cout<<A[i];
  cout<<endl;

  return 0;
}