#include<bits/stdc++.h>
using namespace std;
void s(int n,char a,char b,char c){
	if(n==1){
		cout<<a<<" to "<<c<<endl;
	}else{
		s(n-1,a,c,b);
		cout<<a<<" to "<<c<<endl;
		s(n-1,b,a,c);
	}
}
int main(){
	int n;
	cin>>n;
	s(n,'A','B','C');
	return 0;
}

/**************************************************************
	Problem: 1222
	User: zzz
	Language: C++
	Result: Wrong Answer
****************************************************************/