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 <string>
using namespace std;
int main()
{
	int N;
	scanf("%d",&N);
	char buf[200];
	while(scanf("%s",buf)!=-1)
	{
		string str = buf;
		string res = "";
		if(str.length()%2 == 1)
		{
			str = str.substr(0,str.length()-1);
		}
		while(!str.empty())
		{
			char y = str[0] - 'a';
			char z = str[1] - 'a';
			str = str.substr(2);
			char x ='a'+ (26+y+z-N)%26;
			res.push_back(x);
		}
		printf("%s ",res.c_str());
	}
	return 0;
}
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