challenge

run.cpp

#include <iostream>
#include <string>
#include <map>
#include <algorithm>
#include <vector>

using namespace std;




int main(){


	string letters;
	string target;
	cin>>letters;
	cin>>target;
	//cout<<letters;
	string result;

	vector<int> tarn;
	
	map<char, unsigned> primap;
	map<unsigned , char> invmap;

	string::iterator iter;

	for(unsigned i=0; i<letters.length(); i++){
		primap.insert(pair<char, unsigned>(letters.at(i), (unsigned)i));
		invmap.insert(pair<unsigned, char>((unsigned)i, letters.at(i)));
	}


	for(unsigned i=0; i<target.length(); i++){
		tarn.push_back(primap[target.at(i)]);
	}

	sort(tarn.begin(), tarn.end());

	for(int i=0; i<tarn.size(); i++){
		result += invmap[(unsigned)tarn[i]];
	}

	cout<<result;

	

	return 0;
}