1
2 2
1 1
1 2
 1
1 3
3
1 2 3
 1
1 1
1000
1000
 1
2 2
2 2
2 2
 5
4 5
10 8 6 4
1 2 3 4 5
1 1
3
3
1 1
3
2
5 3
1000 2 2 2 3
3 1 5
5 5
1 2 3 4 5
1 2 3 4 5
 1
4 4
1 1 1 1
1 2 3 4
 1
2 3
1 1
1 2 3

YES
1 1
 YES
1 3
 YES
1 1000
 YES
1 2
 YES
1 4
YES
1 3
NO
YES
1 3
YES
1 1
 YES
1 1
 YES
1 1

a = input()
for x in range(int(a)):
    b = input()
    c = input().split(" ")
    d = input().split(" ")
    ans = -1
    for i in c:
        if(i in d):
            ans = int(i)
            break
        if(ans!=-1):
            break
    if(ans==-1):
        print("NO")
    else:
        print("YES")
        print(1,ans) 