// On each turn, player may select 1..maxPickup pebbles,
// but no more than the remaining number.  Loser is the player
// stuck with an empty pile.

#include <stdlib.h>
#include <stdio.h>

main()
{
int pileSize,maxPickup;

scanf("%d %d",&pileSize,&maxPickup);
while (pileSize && maxPickup)
{
  if (pileSize%(maxPickup+1)==0)
    printf("Can't win\n");
  else
    printf("Win by taking %d\n",pileSize%(maxPickup+1));
  scanf("%d %d",&pileSize,&maxPickup);
}
}