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())
for _ in range(t):
    n,m=map(int,input().split())
    put=input()
    counts=dict()
    for i in range(n):
        counts[put.split()[i]]=counts.get(put.split()[i],0)+1
    #print(counts)
    put=input()
    flag=1
    for i in range (m):
        if put.split()[i] in counts:
            #print(put.split()[i])
            flag=0
            print("YES")
            print(1,put.split()[i])
            break
    if flag==1:
        print("NO")