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>
using namespace std;
int main(){
	//freopen("input.txt", "r", stdin);
	string input;
	int n; cin>>n;//getchar();
	while( !cin.eof()){
		cin >> input;
		int len=input.size()-1;
	
		for(int i=0; i<len; i+=2){
			int a=input[i]-97;
			int b=input[i+1]-97;
			int c=(a+b+26-n)%26;
			cout<<(char)(c+'a');
			//printf("%c",c+'a');
		}
		cout<<" ";
	}
	cout<<endl;
	return 0;
}
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