The sum of the tens digit and the ones digit of a two-digit number is 7. After adding 45 to this two-digit number, the result happens to be a two-digit number formed by swapping the digits. What is the original two-digit number?
一个两位数的十位数字与个位数字的和是7，把这个两位数加上45后，结果恰好成为数字对调后组成的两位数，试求原两位数是多少？
<result>16</result>