Four Number Game by primo

<?for(;$s=fgets(STDIN);print~\xf5)for(;print$s,"$s"!=$s=preg_filter('/\d+(?=( \d+)?)/e','abs(\0-("\1"?:$s))',$s););

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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