The sum of the ones digit and the tens digit of a two-digit number is 12, and the two digits obtained after exchanging the ones digit and the tens digit are 36 less than the original number, what is the original number?
某个两位数的个位数字和十位数字的和是12，个位数和十位数字交换后所得两位数比原数小36，则原数是多少．
<result>84</result>