#include <stdio.h>
#include <iostream>
#include <vector>

using namespace std;

int main() {
  string S; cin >> S;
  char rem = 0;
  
  for (int i = 0; i < S.length(); i++) {
    if (S[i] != rem) {
      cout << S[i];
    }

    rem = S[i];
  }

  cout << endl;
  
  return 0;
}