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

def cmp_ignore_case(s1,s2):
	u1 = s1.upper()
	u2 = s2.upper()
	if u1 < u2:
		return -1 
	if u1 < u2:
		return 1
	return 0 

s = sorted(['bob', 'about', 'Zoo', 'Credit'],cmp_ignore_case)

print s 