my python solution -

def makeAnagram(a, b):

# Write your code here
start = time.time()
count=0
dict_a = {}
dict_b = {}
for i in a:
    if i in dict_a:
        dict_a[i]+=1
    else:
        dict_a[i]=1

for i in b:
    if i in dict_b:
        dict_b[i]+=1
    else:
        dict_b[i]=1

temp_list = list(dict_a.keys()).copy()

for i in temp_list:

    if i in dict_b:
        count += abs(dict_a[i]-dict_b[i])
        dict_a.pop(i)
        dict_b.pop(i)
    else:
        count+=dict_a[i]
        dict_a.pop(i)

count=count+sum(dict_b.values())
print(f'total time: {time.time()-start:.8f}')
return count