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.h>
using namespace std;
int main()
{
	int n;
	cin >> n;
	getchar();
	char in[100200];
	gets(in);
	int len = strlen(in);
	for(int i=0; i<len; i+=2)
	{
		if(in[i] == ' ')
		{
			i--;
			cout << " ";
		}
		else if(in[i+1] == ' ')
		{
			cout << " ";
		}
		else cout << char(((in[i]-'a')+(in[i+1]-'a') - n) % 26 + 'a');
	}
	cout << endl;
}
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