#include<bits/stdc++.h> 
using namespace std;
int main(){
	string s2,s1;
	int p;
	cin>>s2>>s1>>p;
	s1.insert(p,s2);
	cout<<s1;
}
/**************************************************************
	Problem: 2020
	User: linzihang
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2076 kb
****************************************************************/