#!/usr/bin/env python
#coding=utf-8

def UCaseChar(ch):
if ord(ch) in range(97, 122):
return chr(ord(ch) - 32)
return ch

def LCaseChar(ch):
if ord(ch) in range(65, 91):
return chr(ord(ch) + 32)
return ch

def UCase(str):
return ''.join(map(UCaseChar, str))

def LCase(str):
return ''.join(map(LCaseChar, str))

print LCase('ABC我abc')
print UCase('ABC我abc')