from collections import Counter
n,arr=int(input()),list(map(int,input().split()))
m,brr=int(input()),list(map(int,input().split()))
a,b=Counter(arr),Counter(brr)
print(*(sorted((b-a).keys())))

Let us take an example :
n=10
arr=11 4 11 7 13 4 12 11 10 14
m=15
brr=11 4 11 7 3 7 10 13 4 8 12 11 10 14 12
a=Counter(arr)=Counter({11: 3, 4: 2, 7: 1, 13: 1, 12: 1, 10: 1, 14: 1})
b=Counter(brr)=Counter({11: 3, 4: 2, 7: 2, 10: 2, 12: 2, 3: 1, 13: 1, 8: 1, 14: 1})
b-a=Counter({7: 1, 3: 1, 10: 1, 8: 1, 12: 1})
(b-a).keys()=dict_keys([7, 3, 10, 8, 12])
sorted((b-a).keys())=3 7 8 10 12