#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;

char r1[4], r2[4], r3[4], r4[4]; 

int main ( void ) {
    scanf ( "%s %s", &r1, &r2 ) ; 
    
    for ( int i = 2; i >= 0; --i ) { 
            r3[2-i]=r1[i];
            r4[2-i]=r2[i];
            
    }    
    
    
	int x = strlen ( r3 ) ;
	    
	if (  r3[x-1] > r4[x-1] ) printf ( "%s", r3 ) ;  else { printf ( "%s", r4 ) ;  }    
    return 0;    
}