How do I write code for it

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Python

Python2.7

The input will consist of an even number of lines of text. The input will be terminated by a blank line. Suppose there are 2n lines of input. Your program should print out the last n lines of the input, i.e., the second half of the input, followed by the first n lines, i.e., the first half of the input.

E.g., if the input is the following:

our dear friend,

let's eat

then the output should be:

let's eat

our dear friend,

What I have tried:

i = 1
while 1:
line = input()
if line=='':