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 <cstdio>
#include <iostream>
#include <fstream>
#include <deque>
#include <algorithm>
#include <utility>
#include <vector>
#include <cmath>
#include <queue>
#include <string>
using namespace std;
#define in cin
#define out cout
#define PII pair<int, int>
#define x first
#define y second
#define pi 3.14159265358979323846
#define REP(i, v) for(int i=0; i<v; i++)
#define REPEQ(i, s, e) for(int i=s; i<=e; i++)
#define REPRV(i, s, e) for(int i=s; i>=e; i--)
#define all(v) v.begin(), v.end()
#define long long int int64
#define BIG(a, b) ( (a>b?a:b) )
int main()
{
    //freopen("in.txt", "r+", stdin);
    ios::sync_with_stdio(false);
    int n; in >> n;
    char al[] = "abcdefghijklmnopqrstuvwxyz";
    string str;
    while( in >> str )
    {
        int len = str.size();
        REP(i, len/2)
        {
            char a = str[i*2];
            char b = str[i*2+1];
            out << al[( ((a - 'a') + (b - 'a')) - n) % 26];
        } out << " ";
    }
    return 0;
}
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