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input/code.cpp: In function 'std::string d(std::string)':
input/code.cpp:8:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < l; i++) {
                       ^
input/code.cpp:15:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int j = 1; i + j < l; j++) {
                             ^

#include <iostream>
#include <string>


std::string d(std::string s) {
  unsigned l = s.length(); // length of the string // counter
                           // iterate over the string
  for (int i = 0; i < l; i++) {
    l = s.length();
    if (l <= 1) {
      return s;
    }
    int c = 1;
    // increment counter for every identical consecutive character, counter starts at 1 to include the character at i
    for (int j = 1; i + j < l; j++) {
      if (s.at(i) == s.at(i + j)) {
        c++;
      }
      else {
        break;
      }
    }
    if (c > 1) {
      s.erase(i, c); // erase c characters starting at index i
      i = -1; // i will be incremented to 0 when the loop starts again
    }
  }
  return s;
}


int main() {
  std::string s;
  std::cin >> s;

  std::cout << d(s);

  return 0;
}