Comparing lengths

SELECT * FROM gallery2 WHERE topic_id="253287" UNION SELECT * FROM gallery2 WHERE topic_id="195880" UNION SELECT * FROM gallery2 WHERE topic_id="1759180" UNION SELECT * FROM gallery2 WHERE topic_id="1773825" UNION SELECT * FROM gallery2 WHERE topic_id="963350" UNION SELECT * FROM gallery2 WHERE topic_id="824364" UNION SELECT * FROM gallery2 WHERE topic_id="1715801" UNION SELECT * FROM gallery2 WHERE topic_id="490869" UNION SELECT * FROM gallery2 WHERE topic_id="774121" UNION SELECT * FROM gallery2 WHERE topic_id="1376075" UNION SELECT * FROM gallery2 WHERE topic_id="658170" UNION SELECT * FROM gallery2 WHERE topic_id="909846" UNION SELECT * FROM gallery2 WHERE topic_id="1068693" UNION SELECT * FROM gallery2 WHERE topic_id="1221738" UNION SELECT * FROM gallery2 WHERE topic_id="386920" UNION SELECT * FROM gallery2 WHERE topic_id="275331"