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=map(int,input().split())
    l=list(map(int,input().split()))
    l1=list(map(int,input().split()))
    f=False
    if(n>m):
        for i in l:
            if(i in l1):
                f=True
                print('YES')
                print(1,i)
                break
        if(f):
            continue
        else:
            print("NO")
    else:
        for i in l1:
            if(i in l):
                f= True
                print('YES')
                print(1,i)
                break
        if(f):
            continue
        else:
            print('NO')