#include <stdio.h>
int main(void) {
int a,b,wa,sa;
wa=a+b;
sa=a-b;
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgppbnQgbWFpbih2b2lkKSB7CglpbnQgYSxiLHdhLHNhOwoJc2NhbmYoIiVkXG4iLCZhKTsKCXNjYW5mKCIlZFxuIiwmYik7Cgl3YT1hK2I7CglzYT1hLWI7CglwcmludGYoImErYj0lZFxuIix3YSk7CglwcmludGYoImEtYj0lZFxuIixzYSk7CglyZXR1cm4gMDsKfQo=