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 <cstring>
#include <iostream>
#include <string>
using namespace std;
string arr;
int n;
char en(int a,int b)
{
        a += b;
        a -= n;
        if(a < 0) a*= -1;
        a %= 26;
        a += (int)'a';
        return (char)a;
}
int main()
{
        scanf("%d",&n);
        getchar();
        getline(cin,arr);
        for(int i = 0;i < arr.length(); i += 2)
        {
                if(i + 1 >= arr.length() || arr[i + 1] == ' '){
                        printf(" ");
                        continue;
                }
                char a = en((int)(arr[i] - 'a'),(int)(arr[i + 1] - 'a'));
                printf("%c",a);
                if(arr[i + 2] == ' '){
                        printf(" ");
                        i++;
                }
        }
}
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