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 _ in range(int(input())):
    n,m=list(map(int,input().split()));
    a=list(map(int,input().split()));
    b=list(map(int,input().split()));
    sa=set();
    sb=set();
    for i in range(0,n):
        sa.add(a[i]);
    for j in range(0,m):
        sb.add(b[j]);
    if(len(sa&sb)!=0):
        print("YES");
        print("1",end=" ");
        for i in (sa&sb):
            print(i);
            break;
    elif(len(sa&sb)==0):
        print("NO");
        
