#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x)+modulo)%modulo)
#define Inf 1000000000000


int main() {

	string A,B;
	cin>>A>>B;
	
	cout<<A+B<<endl;

    return 0;


}