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):
    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()]
    sub_a = []
    sub_b = []
    flag = 0
    for x in range(len(a)):
        for y in range(len(a)):
            sub_a.append(a[y: y + x])
    for x in range(len(b)):
        for y in range(len(b)):
            sub_b.append(b[y: y + x])
    for x in range(len(sub_a)):
        if sub_a[x] in sub_b and sub_a[x] != []:
            flag = 1
            break
    if flag == 1:
        print("YES")
        print(len(sub_a[x]), *sub_a[x], sep = " ")
    else:
        print("NO")
        
            
            
            
    