#include <iostream>
#include <string>
using namespace std;
int main(void){
string a,b;
string a1,b1;
int x,y;
int br=0;
cin>>a;
cin>>b;
for(int i=a.length()-1;i>=0;i--){
	a1=a1+a[i];
	}
//cout<<a1<<endl;

for(int i=b.length()-1;i>=0;i--){
	b1=b1+b[i];
	}
//cout<<b1<<endl;
for(int i=0;i<a.length();i++){
	if(a1[i]>b1[i]){
	cout<<a1;
	break;
	}
	else if (b1[i]>a1[i]){
		cout<<b1;break;
	}
	else ++br;

}
if(br==a.length()){
	cout<<a1<<endl;
}

	return 0;}