#include<stdio.h>
main()   
{int a,b,t,*p1,*p2;
p1=&a;
p2=&b;
scanf("%d%d\n",p1,p2);
if(a>b)
{t=*p1;*p1=*p2;*p2=t;}
printf("%d%d\n",*p1,*p2);
}