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 <string>
#include <cstdio>
#include <cstdlib>
using namespace std;
int main()
{
    int n;
	string k;
    cin >> n;
    cin >> k;
	
	for(int i = 0; i < k.size() ; i += 2) {
        if (i == k.size() - 1)
            break;
        char ascii = (k[i] - 'a' + k[i + 1] - 'a' - n + 26) % 26 + 'a';
        printf("%c", ascii);
    }
}
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