I have wrong on test #10 What's wrong????
{$A+,B-,D+,E+,F-,G-,I+,L+,N+,O-,P-,Q-,R-,S+,T-,V+,X+,Y+}
{$M 16384,0,655360}

program gsd;
var
x,y:longint;
sum:extended;
begin
  x:=-1;y:=-1;
  while not eoln  do
          read(x,y);
  sum:=x+y;
  if ((sum)<0)and(x>0)and(y>0) then write(x,' ',y) else
  if (x>0)and(y>0) then
     begin
       if ((x mod 2)=0)and((y mod 2)=0)or((x mod 2)=1)and((y mod 2)=1) then
         write(x,' ',y) else write(y,' ',x);
     end else write(x,' ',y);
end.

this is my code...

#include <stdio.h>

long x, y;

void main()
{
    long myx, myy;
    scanf("%ld %ld", &x, &y);
    if ((x + y) % 2 && x > 0 && y > 0) myx = y, myy = x; else myx = x, myy = y;
    printf("%ld %ld", myx, myy);
}