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())
l=[]
for i in range (t):
    n,m=list(map(int,input().split()))
    na=list(map(int,input().split()))
    nb = list(map(int, input().split()))
    na=set(na)
    nb=set(nb)
    s=list(na.intersection(nb))
    if len(s)==0:
        l.append("No")
    else:
        l.append("Yes")
        l.append(f"1 {s[0]}")

for i in l:
    print(i)