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=list(map(int,input().split()))
    a=list(map(int,input().split()))
    b=list(map(int,input().split()))
    if(n==m==1):
        if(a[0]==b[0]):
            print("YES")
            print(1,a[0])
        else:
            print("NO")
    else:
        flag=0
        print("YES")
        for i in range(n):
            if(a[i] in b):
                flag=1
                print(1,a[i])
                break
        if(flag==0):
            print(2,a[0],b[0])
        
        
