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临时测试题：A+B

读入两个整数，输出它们的和。

本题仅用于 NOI Linux 模拟赛端到端演练，使用文件输入输出：sum.in、sum.out。

本场文件读写要求

程序从 stageio.in 读取输入，并将答案写入 stageio.out。