This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <stdio.h>
char s[200];
int main ()
{
	int n;
	scanf ("%d", &n);
	while (scanf ("%s", &s)==1) {
		for (int i=0; s[i]; i+=2) {
			if (s[i+1]==0) break;
			printf ("%c", ((s[i]-'a' + s[i+1]-'a' - n + 26) % 26) + 'a');
		}
		printf (" ");
	}
	return 0;
}
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