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#include <bits/stdc++.h>

using namespace std;

typedef long long lld;

constexpr int INF = (1<<30) - 1;
constexpr lld LINF = (1LL << 62) - 1;
constexpr int MAX_N = 1000000;

string repeat(lld rep, string inside)
{
	if (rep < 1)
	{
		return "";
	}
	if (rep == 1)
	{
		return inside;
	}
	for (int digit = 9; digit >= 2; digit--)
	{
		if (rep % digit == 0)
		{
			string ret = "";
			ret += ('0' + digit);
			ret += '[';
			ret += repeat(rep/digit, inside);
			ret += ']';
			// printf("%d[");
			// repeat(rep/9, inside);
			// printf("]", digit);
			return ret;
		}
	}
	for (int rep2 = 1; rep2 < rep; rep2++)
	{
		if ((rep - rep2) % 9 == 0)
		{
			// repeat(rep - rep2, inside);
			// repeat(rep2, inside);
			string ret = repeat(rep - rep2, inside);
			ret += repeat(rep2, inside);
			return ret;
		}
	}
	
}

/*
void repeat(lld rep, char* inside)
{
	repeat(rep, [inside](void) {printf("%s", inside);});
}
//*/

string repeat(lld rep, char inside)
{
	char s[2] = "A";
	s[0] = inside;
	return repeat(rep, s);
}

string row(lld width)
{
	string ret = repeat(width, "A");
	ret += repeat(width, "EC");
	ret += 'E';
	return ret;
}

string Lu_triangle(lld side);

string Lu_D_triangle(lld side)
{
	string ret = "";
	ret += repeat(2, Lu_triangle(side/2));
	ret += repeat(side/2, 'A');
	string inside = "";
	inside += repeat(side/2, 'E');
	inside += repeat(side/2, "AC");
	inside += 'A';
	ret += repeat(side/2, inside);
	return ret;
}

// left up is the only side left
string Lu_triangle(lld side)
{
	if (side == 1)
	{
		return "C";
	}
	if (side == 2)
	{
		return "CACEC";
	}
	
	string ret = Lu_D_triangle(side/2);
	string inside = "C";
	inside += repeat(side/2-1, "AC");
	inside += repeat(side/2, 'E');
	repeat(side/2, inside);
	ret += Lu_triangle(side/2);
	return ret;
}

string full_triangle(lld side)
{
	if (side < 1)
	{
		return "";
	}
	if (side == 1)
	{
		return "AEC";
	}
	int pow = 1;
	while (pow * 2 <= side)
	{
		pow *= 2;
	}
	string ret = repeat(pow, "A");
	// write_cut_trinagle_bottom(pow);
	lld row_lenght = side - pow;
	ret += repeat(pow, row(row_lenght));
	ret += full_triangle(side - pow);
	ret += Lu_triangle(pow);
	return ret;
}

void solve(int test_number)
{
	lld n;
	scanf("%lld", &n);
	cout << full_triangle(n) << endl;
}

int main()
{
	int test_number = 1;
	// scanf("%d", &test_number);
	for (int test_id = 0; test_id < test_number; ++test_id)
	{
		solve(test_number);
	}
}