#include <cstdio>
#include <algorithm>

using namespace std;

char A[ 4 ], B[ 4 ];
int BA, BB;

int main( void ) {
    scanf( "%s %s", A, B );
    swap( A[ 0 ], A[ 2 ] );
    swap( B[ 0 ], B[ 2 ] );
    
    for( int i = 0; i < 3; ++ i ) {
         BA = BA * 10 + ( A[ i ] - '0' );
         BB = BB * 10 + ( B[ i ] - '0' );     
    }
    
    printf( "%d\n", max( BA, BB ) );
    return 0;   
}