#include<iostream>
#include<string>
using namespace std;

int main(){
	int n;
	string s,t;
	while(cin>>s&&cin>>t&&cin>>n){
	t.insert(n,s);
	cout<<t<<endl;
		}
return 0;
}

/**************************************************************
	Problem: 2020
	User: admin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2076 kb
****************************************************************/