reducer.py

A file contains the DNA sequence of people. Find all the people who have same DNAs.

Input:
“User1 ACGT” 
“User2 TGCA”
“User3 ACG”
“User4 ACGT”
“User5 ACG”
“User6 AGCT”

Output: 
User1, User4
User2
User3, User 5
User6