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//#pragma GCC optimize("O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
using namespace std;
namespace debug { template <class c> struct rge { c b, e; }; template <class c> rge<c> range(c i, c j) { return rge<c>{i, j}; } template <class c> char spk(...); template <class c> auto spk(c* a) -> decltype(cerr << *a, 0); struct stream { ~stream() { cerr << endl; } template <class c> typename enable_if <sizeof spk<c>(0) != 1, stream&>::type operator<<(c i) { cerr << boolalpha << i; return *this; } template <class c> typename enable_if <sizeof spk<c>(0) == 1, stream&>::type operator<<(c i) { return *this << range(begin(i), end(i)); } template <class a, class b> stream& operator<<(pair <a,b> p) { return *this << "(" << p.first << ", " << p.second << ")"; } template <class c> stream& operator<<(rge<c> d) { *this << "["; for (auto it=d.b; it!=d.e; it++) *this << ", " + 2 * (it == d.b) << *it; return *this << "]"; } stream& _dbg(const string& s, int i, int b) { return *this; } template <class c, class ... cs> stream& _dbg(const string& s, int i, int b, c arg, cs ... args) { if (i == (int)(s.size())) return (*this << ": " << arg); b += (s[i] == '(') + (s[i] == '[') + (s[i] == '{') - (s[i] == ')') - (s[i] == ']') - (s[i] == '}'); return (s[i] == ',' && b == 0) ? (*this << ": " << arg << "     ")._dbg(s, i + 1, b, args...) : (s[i] == ' ' ? *this : *this << s[i])._dbg(s, i + 1, b, arg, args...); } };}
#define dout debug::stream()
#define dbg(...) ((dout << ">> ")._dbg(#__VA_ARGS__, 0, 0, __VA_ARGS__))
#define f first
#define s second
#define sc scanf
#define pr printf
#define mp make_pair
#define pb push_back
#define all(x) x.begin(),x.end()
#define ss(x) ((int)((x).size()))
#define rep(i,a,b) for(int i=(a);i<=(b);i++)
#define per(i,a,b) for(int i=(b);i>=(a);i--)
#define upgrade cin.tie(0)->sync_with_stdio(0);
#define lowb(v,x) (lower_bound(all(v),(x))-v.begin())
#define uppb(v,x) (upper_bound(all(v),(x))-v.begin())
#define erase_duplicates(x) {sort(all(x));x.resize(unique(all(x))-x.begin());}
template <class p, class q> pair<p,q> operator-(pair<p,q> a, pair<p,q> b) { return mp(a.f - b.f, a.s - b.s); }
template <class p, class q> pair<p,q> operator+(pair<p,q> a, pair<p,q> b) { return mp(a.f + b.f, a.s + b.s); }
template <class p, class q> void umin(p &a, const q &b) { if (a > b) a = b; }
template <class p, class q> void umax(p &a, const q &b) { if (a < b) a = b; }
using lf=long double;
using ll=long long;
using cll=const ll;
using cint=const int;
using pll=pair<ll,ll>;
using pii=pair<int,int>;
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //

const string digit[10] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"};

string copy(ll n, const string& str)
{
	assert(n >= 0);
	if (str == "") return "";
	if (n == 0) return "";
	if (n == 1) return str;
	if (n == 2 && 2 * str.size() < str.size() + 3) return str + str;
	if (n == 3 && 3 * str.size() < str.size() + 3) return str + str + str;
	per(i, 2, 9) if (n % i == 0) return digit[i] + "[" + copy(n / i, str) + "]";
	return copy(n % 9, str) + copy(n - n % 9, str);
}

string trail(ll n)
{
	return copy(n, "FD") + "F";
}

string trapezoid(ll n)
{
	if (n == 0) return "";
	const auto row = copy(n - 1, "FB") + "F";
	return copy(n - 1, row + copy(n, "D")) + row;
}

string triangle(ll n)
{
	if (n == 0) return "";
	
	ll k = (n - 1) / 2;

	auto res = triangle(k);
	
	res = copy(2, res);

	res += copy(k, "B");

	res += copy(k, "D");

	res += copy(k, "B");

	res += trapezoid(k);

	res += copy(k, "B");

	res += trail(2 * k);
	
	if (n % 2 == 0) res += copy(2 * k + 1, "B") + trail(2 * k + 1);

	return res;
}

int main()
{
	ll n;

	scanf("%lld", &n);
	
	auto res = triangle(n);
	
	res += copy(n, "B") + copy(n, "D");

//	dbg(res.size());
//	assert(res.size() <= 150000);
	
	printf("%s\n", res.c_str());

	return 0;
}