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>
int key;
char buf[999];
int main()
{
	scanf("%d",&key);
	while(scanf("%s",buf)>0)
	{
		int i, j;
		for(i=0;buf[i];i++)
		{
			int p,q;
			p = buf[i];
			q = buf[i+1];
			if(q==0)
				break;
			int r = (p-'a' + q-'a' + 26*26-key)%26;
			printf("%c",r+'a');
			i++;
		}
		printf(" ");
	}
}
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