Complete in python3

Write a simple script using a while loop that simply echos back what a user types (twice). BUT it should stop when you type the word "cracker" (case INsensitively). Should go something like this (use YOUR name instead ):

Johnny want a cracker: Hello Sqwaaaakkk! Hello!! Hello!! Johnny want a cracker: You are a pretty bird Sqwaaaakkk! You are a pretty bird!! You are a pretty bird!! Johnny want a cracker: Cracker ...crunch...crunch...