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 main(void)
{
	char string[20000];
	int n;
	int length;
	scanf("%d\n", &n);
	gets(string);
	
	length = strlen(string);
	for (int i = 0; i < length - 1; i+=2)
	{
		if (string[i] == ' ' || string[i + 1] == ' ')
		{
			printf(" ");
			if (string[i] == ' ')
				i = i - 1;
			continue;
		}
		printf("%c", 'a' + ((26 + string[i] - 'a' + string[i + 1] - 'a'-n)%26));
	}
	return 0;
}
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