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 k in range(t):
    s=list(map(int,input().split()));
    a=list(map(int,input().split()));
    b=list(map(int,input().split()));
#print(s);
#print(a);
#print(b);
    c=0;
    for i in range(s[0]):
        for j in range(s[1]):
            if a[i]==b[j]:
                c=1;
                print("YES");
                print(1,a[i]);
                break;
        if c==1:
            break;
    if c==0:
        print('NO');
