#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  vector<string> ans;
  auto add = [&](int i, int j) {
    string tmp;
    tmp += 'A' + i;
    tmp += 'A' + j;
    ans.emplace_back(tmp);
  };
  rep(i, 26) {
    add(i, i);
    for (int d = 2; d < 26; d++) {
      int g = gcd(d, 26);
      if (i < g) {
        int v = i;
        do {
          int nv = (v + d) % 26;
          add(v, nv);
          v = nv;
        } while (v != i);
      }
    }
    add(i, (i + 1) % 26);
  }
  assert(ssize(ans) == 26 * 26);
  for (auto s : ans) cout << s << '\n';
}