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>
#include <string.h>
int n;
char S[105];
int main() {
	scanf("%d", &n);
	bool first = 1;
	while (scanf("%s", S) != EOF) {
		if (!first) printf(" ");
		first = 0;
		int L = strlen(S);
		for (int i = 0; i < L - 1; i += 2) {
			int x = ((S[i] - 'a') + (S[i + 1] - 'a') - n) % 26;
			if (x < 0) x += 26;
			printf("%c", (char)('a' + x));
		}
	}
}
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