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=[int(x) for x in input().split()]
    a=[int(x) for x in input().split()]
    b=[int(x) for x in input().split()]
    d=[]
    d.append(b[0])
    if(a==b and len(a)>1 and len(b)>1):
        print("YES")
        print(a[0],a[1])
    elif(len(a)==1 or len(b)==1):
        if(a==b):
            print("YES")
            print(1,a[0])
        else:
            print("NO")
    else:
        for i in a:
            if i not in b:
                d.append(i)
        if(len(d)>0):
            print("YES")
            print(d[0],d[2])
        else:
            print("YES")
            print(d[0],a[1])
