#include <iostream>

using namespace std;

int stepCount = 0; // 计数器，用于控制换行

void hanoi(int n, char a, char b, char c) {
    if (n == 1) {
        cout << a << "-->" << c << "   ";
        stepCount++;
        if (stepCount % 5 == 0) {
            cout << endl;
        }
    } else {
        hanoi(n - 1, a, c, b);
        cout << a << "-->" << c << "   ";
        stepCount++;
        if (stepCount % 5 == 0) {
            cout << endl;
        }
        hanoi(n - 1, b, a, c);
    }
}

int main() {
	int n;
	while(cin>>n && n!=0){
		hanoi(n, 'A', 'B', 'C');
		cout << endl; // 输出最后一个换行
		stepCount = 0;
	}
	return 0;
}