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Anagram hackrank solution in python

 #!/bin/python3


import math
import os
import random
import re
import sys



#
# Complete the 'anagram' function below.
#
# The function is expected to return an INTEGER.
# The function accepts STRING s as parameter.
#
from collections import Counter
def anagram(s):
    n=len(s)
    if n%2==0:
        sub1=s[:n//2]
        sub2=s[n//2:]
        a=Counter(sub1)
        b=Counter(sub2)
        return sum((a-b).values())
    return -1
        
            
    # Write your code here

if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    q = int(input().strip())

    for q_itr in range(q):
        s = input()

        result = anagram(s)

        fptr.write(str(result) + '\n')

    fptr.close()

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