A toy factory produces a batch of toys. If each box is filled with 18 boxes, there are still 13 boxes left; if each box is filled with 25 boxes, 11 boxes are needed, but one box cannot be filled. If each box is filled with A pieces, the box A is exactly filled. How much is A.
某玩具厂生产了一批玩具．如果每箱装18个，装满13个箱子还有剩余；如果每箱装25个，需要11个箱子，但是有1箱装不满．如果每箱装A个，恰好装满A箱．A是多少．
<result>16</result>