#include<iostream>
#include<string>
#include<unordered_set>
 
using namespace std;
 
string helper(string& s, int k) {
	if(s.size()<k) return s;
 
	string str;
	for(int i=0; i<s.size(); i++){
		char currChar=s[i];
		int j=i+1, count=0;
		while(j<s.size() && count<=k && s[j]==currChar) {
			j++;
			count++;
		}
 
		if(j-i==k) {
			for(int k=0; k<i; k++) str.push_back(s[k]);
			for(int k=j; k<s.size(); k++) str.push_back(s[k]);
			break;
		}
	}
 
	if(str.empty()) return s;
	return helper(str, k);
}
 
int main() {
	// string s="abbcccb";
	// string s="abcdef";
	// string s="baac";
	string s="aba";
	cout<<helper(s, 2);
	return 0;
}

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