import sys

def inputText():
	input = sys.stdin.readline()
	return input.strip()

def inputChoices(list, backcmd = "b", backtext = "back"):
	repeat = True
	while(repeat):
		repeat = False
		count = 0
		for item in list:
			print count, "-", item
			count += 1
		print backcmd, "-", backtext
		input = inputText()
		if input == backcmd:
			return None
		
		action = int(input)
		if action >= len(list):
			repeat = True
	return action