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

iteration = int(input())
ans = []
for i in range(iteration):
    s = input().split(" ")
    l1 = int(s[0])
    l2 = int(s[1])
    a1 = input().split(" ")
    a2 = input().split(" ")
    print(a1)
    print(a2)
    arr = []
    done = False
    for x in a1:
        for y in a2:
            if x == y:
                arr.append(x)
                break
                done = True
        if done == True:
            breakp
    if len(arr) == 0:
        ans.append("NO")
    else:
        ans.append("YES")
        ans.append("1 "+arr[0])
for x in ans:
    print(x)
