A, B, C, and D all bought lottery tickets, and only one of them won the prize, and the four digits composed of the last four digits of the winning number (in the same order) are exactly a perfect square number. The four digits are 1□□8, the last four digits of B’s lottery ticket is □□45, the last four digits of C’s lottery ticket is 34□1, and the last four digits of D’s lottery ticket is □□40, then the winning number is What is the four-digit number formed by the last four digits.
甲、乙、丙、丁均买了奖券，他们中只有1个人中奖，而中奖号码的最后四位数字组成的四位数(不变顺序)恰是一个完全平方数，已知甲的奖券最后四位数是1□□8，乙的奖券最后四位数是□□45，丙的奖券最后四位数是34□1，丁的奖券的最后四位数是□□40，则中奖号码的后四位数字组成的四位数是多少．
<gadget id="calculator">59 * 59</gadget>
<output>3_481</output>

<result>3_481</result>