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 qwe in range(t):
    
    # n, m = map(int, f.readline().split())
    n, m = map(int, input().split())
    
    # a = list(map(int, f.readline().split()))
    a = list(map(int, input().split()))
    
    # b = list(map(int, f.readline().split()))
    b = list(map(int, input().split()))
    
    flag = False
    
    for i in range(n):
        for j in range(m):
            
            if a[i] == b[j]:
                flag = True
                ans = a[i]
        
        if flag:
            break
    
    if flag:
        print("YES")
        print(1, ans)
    else:
        print("NO")