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(input()):
    p,q=map(int,raw_input().split())
    b=map(int,raw_input().split())
    a=map(int,raw_input().split())
    a1,a2=[0]*1001,[0]*1001
    ok=1
    for i in a:
        a1[i]+=1
    for i in b:
        a2[i]+=1
    for i in range(1,1001):
        if a1[i] and a2[i]:
            print "YES";print 1,i;ok=0;break
    if ok:
        print "NO"
