Write a Python script that computes the score of a query with
each sequence given in FASTA format in database.txt. The query is 
stored in FASTA format in a file called query.txt and the database
sequences are also in FASTA format. Use match cost of +5, mismatch
of -4, and gap cost of -20.

Use the example below to test your program. 

Contents of query.txt:
>query
ACAC

Contents database.txt:
>seq0
GGACACTT
>seq1
GGACGTGC
>seq2
TTTACTTG

The output of your program should be the optimal alignment score of 
query with seq0, followed by query with seq1, and finally query with 
seq2. For the above example your program should output

-60
-69
-78

Submit hardcopies in class on Feb 20th.