#!/usr/bin/env pthon3
# -*- coding: utf-8 -*-

def move(n,a,b,c):
    if n == 1:
        print(a, '-->', c)
    else:
        move(n-1, a, c, b)
        move(1, a, b, c)
        move(n-1, b, a, c)
    pass


move(3, 'A', 'B', 'C')