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);
	string tmp_str;
	cin>>tmp_str;
	char input_str[200];
	gets(input_str);
	string full_str = tmp_str + input_str;
	while(true){
		if(full_str.length() <= 1){
			break;
		}
		if(full_str[1] == ' '){
			printf(" ");
			full_str = full_str.substr(2);
			continue;
		}
		if(full_str[0] == ' '){
			printf(" ");
			full_str = full_str.substr(1);
			continue;
		}
		int first, end;
		first = full_str[0] - 'a';
		end = full_str[1] - 'a';
		int modu = (first+end-n);
		if(modu < 0){
			modu += 26;
		}
		modu = modu%26;
		printf("%c", 'a'+modu);
		full_str = full_str.substr(2);
	}
	printf("\n");
	return 0;
}
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