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

t = int(input())

for i in range(t):
    sizes = input().split()
    a = input().split()
    for k in range(int(sizes[0])):
        a[k] = int(a[k])
    b = input().split()
    for k in range(int(sizes[1])):
        b[k] = int(b[k])

    found = False
    k = 0
    while k < len(a) and not found:
        if a[k] in b:
            print("YES")
            print(1, a[k])
            found = True
        k += 1
    if not found:
        print("NO")
