Write a Python script that determines if a sequence alignment
of length one is 80% conserved. A column is 80% conserved if 
any of the nucleotides A, C, G, and T occur at least in 80%
of the sequences. For example if the input file dna.fasta is

>human
A
>mouse
A
>cat
T
>dog
A
>rat
A
>sheep
A
>cow
T
>goat
A

then your program should output

"Not 80% conserved".

But if the input is 

>human
C
>mouse
C
>cat
C
>dog
C
>rat
C
>sheep
C
>cow
T
>goat
C

then your program should output

"80% conserved"
 
Your program should work for any input file containing any number of 
aligned sequences of length one and not just the above example. 

Submit a hardcopy in class on Nov 19th.