#include<bits/stdc++.h>
#define int long long
#define HuMo long long
#define N ((HuMo)1e3 + 2)
#define HuTao ((HuMo)1e3 + 2)
#define INF ((HuMo)2e18 + 2)
#define base 23333
#define mod ((HuMo)1e9 + 7)
#define db double
#define eps 1e-8
#define lowbit(x) (x&-x)
#define rep(i,x,y) for (HuMo i = (x); i <= (y); ++i)
#define drep(i,x,y) for (HuMo i = (x); i >= (y); --i)
#define go(i,u) for (HuMo i = head[u]; i; i = edge[i].next)
#define go_(i,u) for (HuMo i = head[u]; ~i; i = edge[i].next)
#define pii pair<HuMo, HuMo>
#define MP make_pair
#define fir first
#define sec second
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<typename T> inline T rnd(T l,T r) {return uniform_int_distribution<T>(l , r)(rng);}
template<typename T> inline void read (T &t) {
	t = 0; char f = 0, ch = getchar(); long db d = 0.1;
	while (ch > '9' || ch < '0') f |= (ch == '-'), ch = getchar();
	while (ch <= '9' && ch >= '0') t = t * 10 + ch - 48, ch = getchar();
	if (ch == '.') {
		ch = getchar();
		while (ch <= '9' && ch >= '0') t += d * (ch ^ 48), d *= 0.1, ch = getchar();
	}
	t = (f ? -t : t);
}
template <typename T, typename... Args>
	inline void read (T& t, Args&... args) { read(t); read(args...); }
inline void write (HuMo x) {
	if (x >= 10) write(x / 10);
	printf("%lld", (long long)x % 10);
}
int n;
inline string print (string a, int len) {
	if (a.empty() || !len) return "";
	if (len == 1) return a;
	string tmp;
	tmp.push_back('0' + len);
	if (len <= 9) return tmp + "[" + a + "]";
	return "9[" + print(a, len / 9) + "]" + print(a, len % 9); 
}
inline string solve (int len) {
	if (len == 1) return "A";
	if (len == 2) return "AFACA";
	int mid = (len >> 1);
	if (len & 1) return print(solve(mid), 2) + print("FD", len - 1) + print(print("BD", mid) + "B" + print("F", mid), mid) + print("B", mid) + "A";
	else return solve(len - 1) + print("E", len - 1) + print("AC", len - 1) + "A";
}
signed main() {
	read(n);
	cout << solve(n) + print("E", n) + print("C", n);
return 0;
}