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

	return 0;
}

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