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while(<>){
    ($a, $b)=split/ /;
    print $a - $b, " ";
...
    print $a - $b, " ";
    print (($a+0)-($b+0), "\n");
    }

STDIN:
9 7
900000000000000009 900000000000000007
...
2 2 2 2
0 0 0 2