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//#pragma GCC optimize("Ofast")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#pragma warning(disable:4786)
#pragma warning(disable:4996)
#include <random>
#include <chrono>
#include <ctime>
#include<list>
#include <numeric>
#include<bitset>
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<vector>
#include<set>
#include<map>
#include<functional>
#include<string>
#include<cstring>
#include<cstdlib>
#include<queue>
#include<utility>
#include<fstream>
#include<sstream>
#include<cmath>
#include<stack>
#include<assert.h>
#include<unordered_map>
#include<unordered_set>
#include <array>
#include <complex>
#include<iomanip>
using namespace std;

#define MEM(a, b) memset(a, (b), sizeof(a))
#define CLR(a) memset(a, 0, sizeof(a))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define ABS(X) ( (X) > 0 ? (X) : ( -(X) ) )
#define S(X) ( (X) * (X) )
#define SZ(V) (int )V.size()
#define FORN(i, n) for(int i = 0; i < n; i++)
#define FORAB(i, a, b) for(int i = a; i <= b; i++)
#define ALL(V) V.begin(), V.end()
#define IN(A, B, C)  ((B) <= (A) && (A) <= (C))
#define AIN(A, B, C) assert(IN(A, B, C))

typedef long long int LL;
//typedef __int128 LLL;
typedef long long LLL;

typedef pair<int, int> PII;
typedef pair<LL, LL> PLL;
typedef pair<LL, int> PLI;
typedef pair<double, double> PDD;
typedef vector<int> VI;
typedef vector<LL> VL;
typedef vector<PLL> VPL;
typedef vector<PII> VP;
typedef vector<double> VD;
typedef vector<vector<int>> VVI;
typedef vector<string> VS;
typedef long double ld;
typedef unsigned long long ULL;

//#define MAXN 1000
//#define MAXN2 MAXN*MAXN
#define MAXN 100

//const LL MOD[2] = { 87420317, 1000000007 };
const LL MOD = 1000000007;
//const LL MOD = 998244353;
//const LL MOD = 547892069;
//const LL INF = 2000000000000000001LL; //2e18 + 1

typedef pair<string, int> PSI;

PSI L(string x, LL n) {
	if (n == 0) {
		return { "", 0 };
	}
	if (n == 1) {
		return { x, SZ(x) };
	}
	if (n <= 9) {
		string s;
		s.push_back(n + '0');
		if (SZ(x) == 1) s += x;
		else s += "[" + x + "]";
		return { s, SZ(s) };
	}
	//9[L(ch, n/9)]L(ch, d)
	PSI A = L(x, n / 9);
	PSI B = L(x, n % 9);
	string ret = "";
	ret += "9[" + A.first + "]" + B.first;
	return { ret, A.second + B.second + 3 };
}

string cmd = "ABCDEF";

PSI P(string bend, string down, LL h, LL w) {
	string seed = "";
	PSI A = L(bend, h);
	seed = A.first;
	seed.push_back(bend[0]);
	PSI B = L(down, h);
	seed += B.first;

	PSI C = L(seed, w);
	return C;
}

string createCmd(int a, int b) {
	string ret;
	ret.push_back(cmd[a]);
	ret.push_back(cmd[b]);
	return ret;
}

PSI T_SIDE(int id, LL n);

PSI T_SIDE_SIDE(int id, LL n) {
	assert(n > 0);
	if (n == 1) {
		string ret;
		ret.push_back(cmd[(id + 5) % 6]);
		return { ret, 1 };
	}
	//printf("T_SIDE_SIDE %d\n", n);

	string tmp1 = createCmd((id + 5) % 6, (id + 1) % 6);
	PSI A = L(tmp1, n - 1);
	string tmp2(1, tmp1[0]);
	PSI B = { tmp2, 1 };
	PSI C = T_SIDE((id + 4) % 6, n - 1);
	return { A.first + B.first + C.first, A.second + B.second + C.second };
}

PSI T_SIDE(int id, LL n) {
	assert(n > 0);
	if (n == 1) {
		string ret = createCmd((id + 5) % 6, (id + 1) % 6);
		return { ret, 2 };
	}
	//printf("T_SIDE %d\n", n);
	LL w = n / 2, h = n - w;
	string tmp1 = createCmd((id + 5) % 6, (id + 1) % 6);
	string tmp2 = string(1, cmd[(id + 3) % 6]);
	PSI A = P(tmp1, tmp2, h, w);
	PSI B = T_SIDE(id, h);
	PSI C = T_SIDE_SIDE((id + 2) % 6, w);
	return { A.first + B.first + C.first, A.second + B.second + C.second };
}

PSI T_FULL(LL n) {
	if (n == 1) {
		return { "DFB", 3 };
	}

	LL w = n / 2, h = n - w;

	PSI A = P("DF", "B", h, w);
	PSI B = T_SIDE(4, h);
	PSI C = T_SIDE(0, w);
	PSI D = L("B", h);
	return { A.first + B.first + C.first + D.first, A.second + B.second + C.second + D.second };
}

void solve(int ks) {
	//while (true) {
		LL n;
		scanf("%lld", &n);
		PSI X = T_FULL(n);
		//X.first.clear();
		//printf("%s %d\n", X.first.c_str(), X.second);
		printf("%s\n", X.first.c_str());
	//}

}

void gen() {
}

int main()
{
	double start_time = clock();
#ifdef LOCAL
	//freopen("C:\\Home\\Contests\\F\\sample.in", "r", stdin);
	//freopen("C:\\Home\\Contests\\F\\0.out", "w", stdout);
#endif

	gen();

	if (0) {
		int T;
		scanf("%d", &T);
		//AIN(T, 1, 10);
		for (int ks = 1; ks <= T; ks++) {
			solve(ks);
			//if (ks % 1 == 0) fprintf(stderr, "%d done\n", ks);
		}
	}
	else {
		solve(1);
	}

	double end_time = clock();
	fprintf(stderr, "Time = %lf\n", (end_time - start_time) / CLOCKS_PER_SEC);
	return 0;
}