ABCD represents the four numbers 1, 2, 3, and 4 respectively, and the equation AB*AB+B=BC*CD holds true, so what is the four-digit number ABCD?
ABCD分别表示1、2、3、4这4个数字，且有等式AB*AB+B=BC*CD成立，那么四位数ABCD是多少．
<result>2_134</result>