View Code of Problem 22

#include<bits/stdc++.h>
using namespace std;

int main() {

	string n1,n2;
	while(cin>>n1>>n2){
		set<char> s;
		for(int i=0;i<n1.length();i++){
			char c=n1[i];
			if(n2.find(c)!=-1){
				s.insert(c);
				int k=n2.find(c);
				n2.erase(k,1);
			}
		}
		set<char>::iterator it;
		for(it=s.begin();it!=s.end();it++){
			cout<<*it;
		}
		cout<<endl;
	} 


	return 0;
}