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#include <bits/stdc++.h>

using namespace std;
#define PB push_back
#define LL long long
#define int LL
#define FOR(i,a,b) for (int i = (a); i <= (b); i++)
#define FORD(i,a,b) for (int i = (a); i >= (b); i--)
#define REP(i,n) FOR(i,0,(int)(n)-1)
#define st first
#define nd second
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) ((int)(x).size())
#define VI vector<int>
#define PII pair<int,int>
#define LD long double


template<class T> ostream &operator<<(ostream &os, vector<T> V){
    os<<"[";for(auto vv:V)os<<vv<<",";return os<<"]";
}
template<class T, size_t N> ostream &operator<<(ostream &os, array<T, N> V){
    os<<"[";for(auto vv:V)os<<vv<<",";return os<<"]";
}

template<class L, class R> ostream &operator<<(ostream &os, pair<L,R> P) {
    return os << "(" << P.st << "," << P.nd << ")";
}


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 TH> void _dbg(const char *sdbg, TH h){cerr<<sdbg<<"="<<h<<"\n";}
template<class TH, class... TA> void _dbg(const char *sdbg, TH h, TA... a) {
    while(*sdbg!=',')cerr<<*sdbg++;cerr<<"="<<h<<","; _dbg(sdbg+1, a...);
}


#ifdef LOCAL
#define debug(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (__VA_ARGS__)
#define cerr if(0)cout
#endif

struct DrawInfo{
    int offset;
    string s;
};

string gen_simple_mult_string(int cnt, string s){
    if(cnt == 0){
        return "";
    }
    if(cnt == 1){
        return s;
    }
    if(s.size() > 1) {
        return to_string(cnt) + "[" + s + "]";
    } else{
        return to_string(cnt) + s;
    }
}

void multiply_hlp(int cnt, const string & s, string & output){
    if(cnt >= 0 && cnt <= 9){
        output += gen_simple_mult_string(cnt, s);
        return;
    }

    bool requires_brackets = s.size() > 1;
    FORD(i, 9, 2){
        if(cnt % i == 0){
            output += to_string(i);
            output += "[";
            multiply_hlp(cnt / i, s, output);
            output += "]";
            return;
        }
    }
    output += s;
    multiply_hlp(cnt - 1, s, output);
}

string multiply(int cnt, string s){
    if(cnt == 0){
        return "";
    }
    if(cnt == 1){
        return s;
    }
    bool need_brackets = s.size() > 1;
    if(cnt >= 2 && cnt <= 9){
        return gen_simple_mult_string(cnt, s);
    }
    string result;
    multiply_hlp(cnt, s, result);
    return result;
}

DrawInfo draw_triangle(int n){
    switch(n){
        case 1:
            return{
                    0,
                    "FBD"
            };
        case 2:
            return{
                    0,
                    "FFBDBFBDD"
            };
        case 3:
            return {
                0,
                "3F3BD2E2[AC]DFDBD"
            };
        case 4:
            return {
                0,
                "3[AEAC]AEE2[CE]AEACAEE4C"
            };
        case 5:
            return {
                0,
                "4[AEAC]AEE3[CE]2[AEAC]AEECEAE5C"
            };
        default:
            int small_triangle = (n - 4) / 2;
            auto r = draw_triangle(small_triangle);
            string result = multiply(small_triangle + 2, "D");
            result += "F";
            result += multiply(2,
                               multiply(r.offset + 1, "BF") +
                               r.s +
                               multiply(small_triangle - r.offset, "BF")
                               );
            result += "BF";
            result += multiply(small_triangle + 1, "DF");
            string small_result;
            small_result += multiply(small_triangle + 1, "DB");
            small_result += "D";
            small_result += multiply(small_triangle + 2, "F");
            result += multiply(small_triangle + 1, small_result);
            result += multiply(2 * small_triangle + 2, "DB");
            result += "D";
            result += multiply(2 * small_triangle + 3, "F");
            result += multiply(2 * small_triangle + 4, "B");
            if(n & 1){
                result += "A";
                result += multiply(n, "E");
                result += multiply(n - 1, "CA");
                result += "C";
            }
            result += multiply( small_triangle + 2, "D");
            return{
                 small_triangle + 2,
                 result
            };
    }
}

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout << fixed << setprecision(11);
    cerr << fixed << setprecision(6);
    int n;
    cin >> n;
    cout << draw_triangle(n).s << "\n";
    return 0;
}