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 ())) : 
    m , l = map ( int , input (). split ())
    m1 = list ( map ( int , input (). split ()))
    l1 = list ( map ( int , input (). split ()))
    for i in range(m) :
        if m1[i] in l1 :
            print ( 'YES' )
            print ( 1 , m1[i] , sep = " " )
            break
        elif i == m-1 : 
            print ( 'NO' )