#!/usr/bin/python3

def hamming_distance(array_1, array_2):
    
    if len(array_1) != len(array_2):
        message = 'Both the arrays should have equal lengths'
        return message
    else:
        common_character_count = 0
        for i in range(len(array_1)):
            if array_1[i] != array_2[i]:
                common_character_count += 1
            else:
                continue
        return common_character_count
    
print(hamming_distance('shweta', 'sharma'))