python inverse string

`#!/usr/bin/env python
#encoding=utf-8
print 'kill game by input end'
while 1:
	s=input("input string:")
	if s== 'end':
		break;
	s1='';
	index=0;
	l=len(s);
	print s[l-index-1];
	while index<l:
		s1=s1+s[l-index-1];
		index=index+1;
	print s1`