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// {{{
#define _USE_MATH_DEFINES
#include <bits/stdc++.h>

#define each(...)    for (auto& __VA_ARGS__)
#define rep(i, b, e) for (int i = (b); i <= (e); i++)
#define rev(i, b, e) for (int i = (e); i >= (b); i--)
#define mp make_pair
#define mt make_tuple
#define x first
#define y second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#ifdef SPONGE
#define dbg(f, ...) fprintf(stderr, "\033[1;33m" f "\033[0m", ##__VA_ARGS__)
#else
#define dbg(...) 1
#endif
#define tC template<class

using namespace std;

tC T> using V = vector<T>;
tC T1, class T2> using P = pair<T1,T2>;
tC T, class C=greater<T>> using PQ = priority_queue<T,V<T>,C>;

using ll = long long;
using ld = long double;
using ul = unsigned long long;
using pii = P<int,int>;
using pll = P<ll,ll>;
using pld = P<ld,ld>;
using vi = V<int>;
using vll = V<ll>;
using vld = V<ld>;
using vb = V<bool>;
using vs = V<string>;
using vpii = V<pii>;
using vpll = V<pll>;
using vpld = V<pld>;

tC T> int sz(const T& a) { return (int)a.size(); }
tC T> bool amin(T& a, T b) { return b < a ? a = b, 1 : 0; }
tC T> bool amax(T& a, T b) { return b > a ? a = b, 1 : 0; }

const size_t rseed = 4488;
// chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 rnd(rseed);
tC T> T rand(T lo, T hi) { return uniform_int_distribution<T>{lo,hi}(rnd); }

const int oo = 1e9 + 1;
const ll OO = 1e18 + 1;

namespace { void solve(); }
// }}}

int main()
{
  int t = 1;
  // scanf("%d", &t);
  rep(i, 1, t) {
    // printf("Case #%d: ", i);
    solve();
  }
}

namespace {

string powtorz_rek(string s, ll ile)
{
  if (ile <= 9) {
    if (ile * sz(s) <= 3 + sz(s)) {
      string ret = "";
      rep(i, 1, ile) ret += s;
      return ret;
    }
    else {
      return to_string(ile) + "[" + s + "]";
    }
  }
  else {
    rev(d, 2, 9) {
      if (ile % d == 0) {
        return to_string(d) + "[" + powtorz_rek(s, ile / d) + "]";
      }
    }
    return "9[" + powtorz_rek(s, ile / 9) + "]" + powtorz_rek(s, ile % 9);
  }
}

#define powtorz powtorz_rek
/*
map<pll,pll> mapka;

string powtorz(string s, ll ile)
{
  string ret = powtorz_rek(s, ile);
  mapka[mp(sz(s), ile)].x = sz(ret);
  mapka[mp(sz(s), ile)].y++;
  return ret;
}
*/

/* Kierunki
   E     F
 D    .    A
   C     B
*/

string rysuj_rek(ll n)
{
  if (n == 1) {
    return "";
  }
  else {
    ll k = n / 2;
    string ret = "";
    ret += powtorz("A", k);
    ret += powtorz(powtorz("E", k - 1) + powtorz("AC", k - 1) + "A", k - 1);

    if (n % 2 == 1) {
      ret += powtorz("E", n - 2);
      ret += powtorz("AC", n - 2);
      ret += "A";
    }
    ret += powtorz("CE", n - 1);

    ret += "F";
    ret += powtorz(rysuj_rek(k), 2);

    if (n % 2 == 1) {
      ret += "F";
    }

    return ret;
  }
}

string rysuj(ll n)
{
  string ret = "";
  ret += powtorz("B", n);
  ret += powtorz("D", n);
  ret += "F";
  ret += rysuj_rek(n);
  return ret;
}

void solve()
{
  ll n;
  scanf("%lld", &n);
  printf("%s\n", rysuj(n).c_str());

  /*
  FILE *f = fopen("mapka.out", "w");
  assert(f);
  each([xy, st] : mapka) {
    //dbg("|s|=%lld ile=%lld -> %d\n", xy.x, xy.y, z);
    fprintf(f, "%lld %lld %lld %lld\n", xy.x, xy.y, st.x, st.y);
  }
  fclose(f);
  */
}

}