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/*
* Me, as a maintainer: No, you can NOT use magic numbers like that!
* Also me, doing competitive:
*/
#include <stdio.h>
int main()
{
int t, a, c;
scanf("%d ", &t);
while (t--) {
for (a = 420; (c = getchar()) > 42; a += 48 - putchar(c));
printf("%d\n", a % 10);
}
return 0;
}
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