Eval teh einput by 

a,b;\x0d
main(i) \x0d
{\x0d
scanf("%d %d%c",&a,&b,&i);\x0d
printf("%d",i==43?a+b:a-b);\x0d
}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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