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 <cstdio>
int main() {
	int n;
	char y, z;
	scanf("%d", &n);
	getchar();
	while(1) {
		scanf("%c", &y);
		if(y == '\n') break;
		if(y == ' ') {
			printf(" ");
			continue;
		}
		scanf("%c", &z);
		if(z == '\n') break;
		if(z == ' ') {
			printf(" ");
			continue;
		}
		char x = y-'a'+z-'a';
		if(x >= 26) x -= 26;
		x -= n;
		if(x < 0) x += 26;
		printf("%c", x+'a');
	}
}
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