#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s1,s2;
    int k;
    cin>>s1>>k>>s2;
    s1.insert(k,s2);
    cout<<s1;
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
string s1;
string s2;
int main()
{
	int n;
	cin>>s1;
	cin>>n;
	cin>>s2;
	s1.insert(n,s2);
	cout<<s1;
	return 0;
}

#include<bits/stdc++.h>
using namespace std;
string s1;
string s2;
int n;
int main(){
	cin>>s1;
	cin>>n;
	cin>>s2;
	s1.insert(n,s2);
	cout<<s1;
	
	
	return 0;
}