def makeAnagram(a, b):
    difference = {}
    only_b = 0
    
    for char in a:
        difference[char] = difference.get(char, 0) + 1
    
    for char in b:
        if char in difference and difference[char] > 0:
            difference[char] -= 1
        else:
            only_b+=1
    
    totalElementsA = sum(difference.values())
    
    return abs(totalElementsA + only_b)