#include<iostream>
#include<string>
using namespace std;

string type1(string line,int n) {
    char temp;
    for (int i = 0; i<n/2; i++) {
        temp = line[i];
        line[i] = line[n - i-1];
        line[n - i - 1] = temp;
    }

    return line;
}

string type2(string line, int k,int n) {
    for (int i = 0; i<n; i++) {
        if ((int)line[i] + k>'z')
            line[i] = line[i] - 26 + k;
        else
            line[i] += k;
    }

    return line;
}

string type3(string line, int k,int n) {
    for (int i = 0; i<n; i++) {
        if ((int)line[i] - k<'a')
            line[i] = line[i] + 26 - k;
        else
            line[i] -= k;
    }

    return line;
}

int main() {
    int n = 0;
    string ch[3], output, o_type1, o_type2, o_type3;

    cin >> n;
    getchar();
    for (int i = 0; i<3; i++) {
        getline(cin,ch[i]);

    }
    for (int i = 0; i<3; i++)
        for (int j = 0; j<3; j++) {
            if (j == i)
                continue;
            for (int k = 0; k<3; k++) {
                if (k == i || k == j)
                    continue;
                else {
                    o_type1 = type1(ch[i],n);
                    for (int m = 0; m<=6; m++) {
                        o_type2 = type2(ch[j], m,n);
                        o_type3 = type3(ch[k], m,n);
                        if ((o_type1 == o_type2) && (o_type1 == o_type3))
                            output = o_type1;
                    }
                }
            }
        }
    cout << output;

    return 0;
}