Write a Python script that translates an mRNA sequence into a protein.
Your program should start from AUG (the start codon) and stop when it
sees either of the stop codons UAA, UAG, and UGA. 

The input is given by the user on the keyboard. Use the input()
function. 

For example if the user typed

AAAUGAGGUAAA

then the output should be MR.

Hint: When determining the position of the stop codon be mindful. Consider
the positions of UGA in AAAUGAAAUGA. 

Submit a hardcopy in class on Oct 10th.