This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/*
 * v.cpp
 *
 *  Created on: 2014. 9. 28.
 *      Author: minque
 */
#include <iostream>
#include <cstring>
using namespace std;
int main(){
	int n, len, i, cnt=0, t=0;
	char enc[102];
	cin>>n;
	while(cin>>enc){
		if(cnt++) cout<<' ';
		len = strlen(enc);
		for(i = 0; i+1 < len; i+=2){
			t=(enc[i]-'a' + enc[i+1]-'a' - n);
			if(t < 0) t=26+t;
			cout<<(char)((t)%26+'a');
		}
	}
	cout<<endl;
	return 0;
}
/*Sample
2
ab axcexseg yzkansuqe mlssltqu
  */
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