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

signed main(){
  string s;
  cin>>s;
  int len=s.length();
  cout<<s[0];
  for(int i=1;i<len;i++){
    if(s[i] != s[i-1]) cout<<s[i];
  }
  cout<<endl;
  return 0;
  

}