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

for t in range(int(input())):
    n, m = map(int, input().split())
    arr1 = list(map(int, input().split()))
    arr2 = list(map(int, input().split()))
    x = "NO"
    for a in range(n):
        for b in range(m):
            if arr1[a] == arr2[b]:
                x = "YES"
                ans = arr1[a]
                break
    
    print(x)
    if x == "YES":
        print(1, ans)