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

def comm_subseq(a,b):
    com = list(set(a) & set(b))
    l = []
    if com:
        l.append(1)
        l.append(com[0])
        print("YES")
        return l
    else:
        print("NO")
        return []
t = int(input())
for _ in range(t):
    nm = input().split()
    n = int(nm[0])
    m = int(nm[1])
    a = list(map(int,input().split()))
    b = list(map(int,input().split()))
    result = comm_subseq(a,b)
    if result:
        print(*result,sep=" ")