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>
using namespace std;
int main()
{
    int n;
	char a = -1, b = -1, ans;
	scanf("%d\n", &n);
    while(1){
        scanf("%c", &b);
		if (b == -1)
			break;
		else if (b == ' ' || b == '\n'){
			printf(" ");
			a = -1;
		}
		else if (a == -1)
			a = b;
		else{
			a-='a';
			b-='a';
			ans = (a+b-n)%26;
			ans+='a';
			printf("%c",ans);
			a=-1;
		}	
	}
	printf("\n");
	return 0;
}
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