Group A consists of five numbers 1, 3, 5, 7, and 9, and group B consists of four numbers 2, 4, 6, and 8. How many different sums can be obtained by adding one number from each of the two sets of numbers A and B?
由1，3，5，7，9五个数组成甲组数，2，4，6，8四个数组成乙组数．由甲、乙两组数中各取一个数相加，共可得到多少个不同的和．
<result>8</result>