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):
    n, m = map(int, input().split())
    a = [False for p in range(1001)]
    b = [False for p in range(1001)]
    for c in input().split():
        a[int(c)] = True
    for c in input().split():
        b[int(c)] = True
    j = 0
    for j in range(1,1001):
        if a[j] == True and b[j] == True:
            print("YES")
            print("1 " + str(j))
            break
    if j == 1000:
        print("NO")