A+B for Input-Output Practice (VII)

Your task is to Calculate a + b.

The input will consist of a series of pairs of integers a and b, separated by a space, one pair of integers per line.

For each pair of input integers a and b you should output the sum of a and b, and followed by a blank line.

零基础的同学可以先学习基础，教程见:  C语言教程、C++教程、编译器教程、数据结构教程、Python教程、单片机教程等

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