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):
    x=input().split()
    n=int(x[0])
    m=int(x[1])
    a=[0 for i in range(1,1002)]
    b=input().split()
    b=list(map(int,b))
    for j in b:
        a[j]=1
    b=input().split()
    b=list(map(int,b))
    k=0
    for j in b:
        if (a[j]==1):
            k=1
            print('YES')
            print('1',j)
            break
    if (k==0):print('NO')