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 <iostream>
#include <string>
#include <map>
#include <queue>
#include <set>
#include <vector>
using namespace std;
int main(void){
	int n;
	scanf("%d", &n);
	char input_str[2000];
	while(scanf("%s", input_str) != -1){
		string full_str = input_str;
		string res_str;
		if(full_str.length()%2 == 1){
			full_str = full_str.substr(0, full_str.length()-1);
		}
		while(!full_str.empty()){
			int first, end;
			first = full_str[0] - 'a';
			end = full_str[1] - 'a';
			full_str = full_str.substr(2);
			int modu = (26+first+end-n)%26;
			printf("%c", 'a'+modu);
		}
		printf(" ");
	}
	printf("\n");
	return 0;
}
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