#include<bits/stdc++.h>
using namespace std;
int main(){
	string s1,s2;
	int p;
	cin>>s2;
	cin>>s1;
	cin>>p;
	s1.insert(p,s2);
	cout<<s1;
	
}
/**************************************************************
	Problem: 2020
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/