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#include <vector>
#include <iostream>
#include <sstream>
#include <math.h>
#include <sys/time.h>
#include <cstdlib>
#include <algorithm>
#include <cassert>
#include <cstring>
#include <fstream>
#include <set>
#include <map>
#include <iomanip>
#include <queue>

#define FOR(i,a,b)  for(__typeof(b) i=(a);i<(b);++i)
#define REP(i,a)    FOR(i,0,a)
#define FOREACH(x,c)   for(__typeof(c.begin()) x=c.begin();x != c.end(); x++)
#define ALL(c)      c.begin(),c.end()
#define CLEAR(c)    memset(c,0,sizeof(c))
#define SIZE(c) (int) ((c).size())

#define PB          push_back
#define MP          make_pair
#define X           first
#define Y           second

#define ULL         unsigned long long
#define LL          long long
#define LD          long double
#define II         pair<int, int>
#define DD         pair<double, double>
#define FF          pair<float,float>

#define VC	    vector
#define VI          VC<int>
#define VVI         VC<VI>
#define VVVI        VC<VVI>
#define VD          VC<double>
#define VS          VC<string>
#define VII         VC<II>
#define VDD         VC<DD>
#define VFF         VC<FF>
#define VVD         VC<VD>
#define VVVD        VC<VVD>
#define VULL         VC<ULL>

#define DB(a)       cerr << #a << ": " << a << endl;

using namespace std;

template<class T> void print(VC < T > v) {cerr << "[";if (SIZE(v) != 0) cerr << v[0]; FOR(i, 1, SIZE(v)) cerr << "," << v[i]; cerr << "]\n";}
template<class T> string i2s(T &x) { ostringstream o; o << x; return o.str(); }
VS split(string &s, char c = ' ') {VS all; int p = 0, np; while (np = s.find(c, p), np >= 0) {all.PB(s.substr(p, np - p)); p = np + 1;} if (p < SIZE(s)) all.PB(s.substr(p)); return all;}

ULL N;
int d;

string repeat(ULL k, string s){
    string t;
    int d = 0;
    while(1){
        int div = 9;
        while (div >= 2 && k%div > 0) div--;
        if (div == 1){
            div = 9;
            while (k%div > 1) div--;
        }
        if (k%div == 1) { t.append(s); k--; }
        if (k == 0) break;
        t.append(to_string(div)+"[");
        d++;
        k /= div;
    }
    REP(i,d) t.append("]");
    return t;
}

void base(ULL k){
    if (k == 1){ cout << "BD"; return;}
    if (k%2 == 0){
        cout << repeat(k,"B");
        cout << repeat(k-1,"DF");
        cout << "D";
        k -= 1;
    }
    if (k == 1){ cout << "BD"; return;}
    cout << "2[";
    base(k/2);
    cout << "]";
    cout << repeat(k-1,"BF");
    // rect begin
    cout << repeat(k/2,repeat(k/2,"E") + repeat(k/2-1,"CA") + "C");
    cout << repeat(k/2,"A"); 
    // rect end
    cout << "B";
    cout << repeat(k,"D");
}

void draw(ULL N){
    cout << repeat(N,"F");
    base(N);
    cout << endl;
}

int main(int argc, char *argv[]){
    cin >> N;
    draw(N);
    return 0;
}