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 k in range(t):
    ab = list(map(int,input().split()))
    a = ab[0]
    b = ab[1]
    arr1 = list(map(int,input().split()))
    arr2 = list(map(int,input().split()))
    mp1 = {}
    mp2 = {}
    flag = 0
    for i in arr1:
        mp1[i] = 1
    for i in arr2:
        mp2[i] = 1
    for i in mp1:
        if i in mp2:
            flag = 1
            print("YES")
            print(1,i)
            break
    if not flag:
        print("NO")
