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());

while t:
    n,m=[int(x) for x in input().split()];
    a=[int(x) for x in input().split()];
    b=[int(x) for x in input().split()];
    flag=0;
    if n<m:
        for num in a:
            if num in b:
                print("YES");
                print(1,num);
                flag=1;
                break;
        if not flag:
            print("NO");
    else:
        for num in b:
            if num in a:
                print("YES");
                print(1,num);
                flag=1;
                break;
        if not flag:
            print("NO");
    t-=1;
