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

for T in range(int(input())):
    n,m=[int(x) for x in input().split()]
    a=list(map(int, input().split()))
    b=list(map(int, input().split()))
    if n<m: 
        n,m=m,n
        a,b=b,a
    k=[]
    for i in range(n):    
        for j in range(m):
            if a[i]==b[j]: k.append(a[i])
    if len(k)>0:
        print("YES")
        k=sorted(list(set(k))) 
        z=''.join(str(x) for x in k if x>1)
        print(1,z[0])
    else: print("NO")