#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    set<pair<int, int>> st;
    int n = 26;
    rep(i, n) rep(j, n) {
        st.insert({i, j});
    }
    rep(i, n) {
        rep(j, n) {
            if (j == 1)
                continue;
            if (!st.contains({i, (i + j) % 26}))
                continue;
            int cur = i;
            while (true) {
                int nx = (cur + j) % n;
                cout << char(cur + 'A');
                cout << char(nx + 'A') << endl;
                st.erase({cur, nx});
                cur = nx;
                if (nx == i)
                    break;
            }
        }
        cout << char(i + 'A');
        cout << char((i + 1) % n + 'A') << endl;
    }
    return 0;
}