#include<iostream>
using namespace std;
int count=0;
void printa(char A,char C){

		if(count==5){
			cout <<endl;
		 count=0;
		}
	cout <<A <<"-->" <<C<<"   ";
		count++;
	
}
void  a(char A,char B,char C,int n){
	if(n==1){
   printa(A,C);
   
	}
	else{
	a(A,C,B,n-1);
	a(A,B,C,1);
	a(B,A,C,n-1);
	}
}

	int main(){

		int n;
		while(cin >>n&&n){//n带在while循环里面
			
   a('A','B','C',n);
   cout <<endl;
   count =0;//注意清0
		}
		return 0;
	}