#include <iostream>
#include<string.h>
#include<stdio.h>
using namespace std;
char s[100],c[10],aux[150],*p;
int main()
{int n;
cin>>n;
gets(s);
gets(c);
strcpy(aux,s+n);
strcpy(s+n,c);
strcpy(s+n+strlen(c),aux);
cout<<s;
}