题目描述
Your task is to Calculate a + b.
输入描述
The input will consist of a series of pairs of integers a and b, separated by a space, one pair of integers per line.
输出描述
For each pair of input integers a and b you should output the sum of a and b, and followed by a blank line.
样例输入
1 5 10 20
样例输出
6 30
来源
基础