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 <cstdio>
#include <cstring>
using namespace std;
int main() {
    int n;
    char buf[11000];
    cin >> n;
    getchar();
    //cin.getline(buf, 11000);
    fgets(buf, 11000, stdin);
    int len = strlen(buf);
    for (int i=0;i<len;i+=2) {
        char a=buf[i],b = buf[i+1];
        if(a==' '){
            printf(" ");
            i++;
            a = buf[i];
            b = buf[i+1];
        }
        if(b!=' ' && b!='\n') {
            printf("%c", ((a-'a'+b-'a'-n)%26)+'a');
        }
        else{
            printf(" ");
        }
    }
    cout << endl;
    return 0;
}
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