#include <stdio.h>

int main(void) {
  int M, m, max, min;
   while (M != 0)  {
      scanf("%d", &M);
      scanf("%d", &m);
  if (m!=0) {
       if (M<m){
    max=m;
    min=M;
    } else
        max=M;
        min=m;
    } else max=M;
           min=M;
   }
    printf("%d %d", max, min);
  return 0;
}