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#include <bits/stdc++.h>
#define MP make_pair
#define PB push_back
#define int long long
#define st first
#define nd second
#define rd third
#define FOR(i, a, b) for(int i =(a); i <=(b); ++i)
#define RE(i, n) FOR(i, 1, n)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define REP(i, n) for(int i = 0;i <(n); ++i)
#define VAR(v, i) __typeof(i) v=(i)
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) ((int)(x).size())
#define __builtin_ctz __builtin_ctzll
#define __builtin_clz __builtin_clzll
#define __builtin_popcount __builtin_popcountll
using namespace std;
template<typename TH> void _dbg(const char* sdbg, TH h) { cerr<<sdbg<<"="<<h<<"\n"; }
template<typename TH, typename... TA> void _dbg(const char* sdbg, TH h, TA... t) {
  while(*sdbg != ',') { cerr<<*sdbg++; } cerr<<"="<<h<<","; _dbg(sdbg+1, t...);
}
#ifdef LOCAL
#define debug(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#define debugv(x) {{cerr <<#x <<" = "; FORE(itt, (x)) cerr <<*itt <<", "; cerr <<"\n"; }}
#else
#define debug(...) (__VA_ARGS__)
#define debugv(x)
#define cerr if(0)cout
#endif
#define next ____next
#define prev ____prev
#define left ____left
#define hash ____hash
typedef long long ll;
typedef long double LD;
typedef pair<int, int> PII;
typedef pair<ll, ll> PLL;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VLL;
typedef vector<pair<int, int> > VPII;
typedef vector<pair<ll, ll> > VPLL;

template<class C> void mini(C&a4, C b4){a4=min(a4, b4); }
template<class C> void maxi(C&a4, C b4){a4=max(a4, b4); }
template<class T1, class T2>
ostream& operator<< (ostream &out, pair<T1, T2> pair) { return out << "(" << pair.first << ", " << pair.second << ")";}
template<class A, class B, class C> struct Triple { A first; B second; C third;
  bool operator<(const Triple& t) const { if (st != t.st) return st < t.st; if (nd != t.nd) return nd < t.nd; return rd < t.rd; } };
template<class T> void ResizeVec(T&, vector<int>) {}
template<class T> void ResizeVec(vector<T>& vec, vector<int> sz) {
  vec.resize(sz[0]); sz.erase(sz.begin()); if (sz.empty()) { return; }
  for (T& v : vec) { ResizeVec(v, sz); }
}
typedef Triple<int, int, int> TIII;
template<class A, class B, class C>
ostream& operator<< (ostream &out, Triple<A, B, C> t) { return out << "(" << t.st << ", " << t.nd << ", " << t.rd << ")"; }
template<class T> ostream& operator<<(ostream& out, vector<T> vec) { out<<"("; for (auto& v: vec) out<<v<<", "; return out<<")"; }
template<class T> ostream& operator<<(ostream& out, set<T> vec) { out<<"("; for (auto& v: vec) out<<v<<", "; return out<<")"; }
template<class L, class R> ostream& operator<<(ostream& out, map<L, R> vec) { out<<"("; for (auto& v: vec) out<<v<<", "; return out<<")"; }

string MultK(string s, int k) {
//   if (k == 0) { return ""; }
//   if (k == 1) { return s; }
//   string rec = MultK(s, k / 2);
//   string res =  "2[" + rec + "]";
//   if (k % 2) { res += s; }
//   return res;
  if (k == 0) { return ""; }
  if (k == 1) { return s; }
  if (k <= 9) { 
    string cand = string(1, '0' + k) + "[" + s + "]";
    if (SZ(s) * k < SZ(cand)) {
      string heh;
      REP (i, k) {
        heh += s;
      }
      return heh;
    }
    return cand;
  }
  string rec = MultK(s, k / 9);
  return "9[" + rec + "]" + MultK(s, k % 9);
}

string Get(int n) {
  assert(n >= 1);
  if (n == 1) {
    return "B";
  }
  if (n == 2) {
    return "BDBFB";
  }
  if (n == 3) {
    return "BDBDBFFBDBFB";
  }
  string s;
  if (n % 2 == 1) {
    debug(n);
    s = "B";
    s += MultK("DB", n - 1);
    s += MultK("F", n - 1);
    n--;
  }
  s += MultK("BD", n / 2);
  string col = MultK("BD", n / 2 - 1);
  col += "B";
  col += MultK("F", n / 2);
  s += MultK(col, n / 2);
  s += MultK("D", n / 2 - 1);
  s += MultK("F", n / 2 - 1);
  string rec = Get(n / 2 - 1);
  s += MultK(rec, 2);
  s += MultK("D", n / 2 - 1);
  s += MultK("BF", n / 2 - 1);
  s += "B";
  return s;
}

int32_t main() {

  ios_base::sync_with_stdio(0);
  cout << fixed << setprecision(10);
  cerr << fixed << setprecision(10);
  cin.tie(0);
  //double beg_clock = 1.0 * clock() / CLOCKS_PER_SEC;
  
//   string s = "D";
//   debug(MultK(s, 122));
  int n;
  cin>>n;
  string s = Get(n);
  s += MultK("D", n);
  s += MultK("F", n);
  debug(SZ(s));
  //assert(SZ(s) < 121000);
  cout<<s<<endl;
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  return 0;
}