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

testcases = int(input())
for i in range(testcases):
    n, m = map(int,  input().strip().split(" "))
    x = list(map(int, input().strip().split(" ")))
    y = list(map(int, input().strip().split(" ")))
    flag = 0
    for p in range(len(x)):
        for q in range(len(y)):
            if x[p] == y[q]:
                print("YES")
                print(1, x[p])
                flag = 1
                break
        if flag == 1:
            break
    if flag == 0:
        print("NO")

