For a two-digit number, the ones digit is 1 greater than the tens digit, and a new two-digit digit is obtained by exchanging the ones and tens digits. If the sum of the original number and the new number is 99, the two digits What is the number.
一个两位数，个位上的数字比十位上的数字大1，把个位和十位数字交换位置后得到一个新的两位数，如果原数和新数的和99，这个两位数是多少．
<result>45</result>