def makingAnagrams(s1, s2):
    samechar = 0
    lst = list(s2)
    
    for i in s1:
        if (i in lst):
            lst.remove(i)
            samechar += 1
    
    return len(lst) + len(s1) - samechar

s1 = input()
s2 = input()

result = makingAnagrams(s1, s2)

print(result)