<?php
fscanf(STDIN, "%s", $str1);
fscanf(STDIN, "%s", $str2);

if (!checkNum($str1)) { endPg('NG'); };
if (!checkNum($str2)) { endPg('NG'); };
endPg('OK');

function checkNum($val) {
    if ($val !== (string)(int)$val) {
        return false;
    }
    if ($val >= 0 && $val <= 12345) {
        return true;
    }
    return false;
}

function endPg($result) {
    echo $result."\n";
    exit;
}