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>
char S[10210];
int N,K;
int main()
{
	int i,a,b,c;
	scanf("%d ",&K);
	gets(S);
	N=strlen(S);
	S[N]=' ';
	for(i=0;i<N;i++){
		if(S[i]==' '){
			printf(" ");
			continue;
		}
		else if(S[i+1]==' '){
			i++;
			printf(" ");
			continue;
		}
		a=S[i]-'a';b=S[i+1]-'a';
		c=(a+b-K)%26+'a';
		printf("%c",c);
		i++;
	}
	printf("\n");
	return 0;
}
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