#include<stdio.h>
int main(void)
{
  int scan;//scanf警告用
  char h[200010],s[200010];
  scan=scanf("%s %s",h,s);
  int hlen=strlen(h);
  int slen=strlen(s);
  int hh=h[hlen-1]-'0';
  int ss=s[slen-1]-'0';
  if(hh%2==ss%2)printf("Possible");
  else printf("Impossible");
  return 0;
}