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())
while t:
    t-=1
    x,y = map(int,input().split())
    m = list(map(int,input().split()))
    n = list(map(int,input().split()))
    c  = set()
    s = []
    
    for i in m:
        if i not in s:
            c.add(i)
    
    for i in c:
        if i in n:
            s.append([i])
                
    
    if s:
        if s[-1]:
            print("Yes")
            print(len(s[-1]),*s[0])
        else:
             print("No")
    else:
        print("No")