View Code of Problem 3924

#include <iostream>
#include <cmath>
#include <cstring>
#include <algorithm>
using namespace std; 
int main(){
  	string ss,s2;
  	cin>>ss;
  	cout<<ss[0];
  	for(int i=1;i<ss.length();i++){
  		if(ss[i]==ss[i-1])
  			continue;
  		else cout<<ss[i];
  		
	}

	return 0;
}