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 <iostream>
#include <stdio.h>
#include <string>
#include <stdlib.h>
#include <string.h>
using namespace std;
int main()
{
	int n;
	
	char buf[100 * 101 + 1];
	scanf("%d ", &n);
	gets(buf);
	int len = strlen(buf);
	
	char first;
	char second;	
	bool isFirst = true;
	string str_ret;
	int count = 0;
	for (int i = 0; i < len; i++)
	{
		count++;
	
		if (buf[i] == ' ')
		{
			str_ret += " ";
			count = 0;
			isFirst = true;
			continue;
		}
		
		if (isFirst == true)
		{
			first = buf[i] - 'a';
			isFirst = false;
		}
		else
		{
			second = buf[i] - 'a';
			isFirst = true;
		}
		if (count % 2 == 0)
			str_ret += (char)((first + second - n + 26) % 26) + 'a';
	}
	cout << str_ret << endl;
}
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