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 x in range(t):
    flag = 0
    size = input().split()
    n = int(size[0])
    m = int(size[1])
    a = [int(x) for x in input().split()]
    b = [int(x) for x in input().split()]
    for x in a:
        if x in b:
            flag = 1
            
    if flag == 1:        
        print("YES")
        print(1,x, sep = " ")
        
    else:            
        print("NO")
        
            
            
            
    