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())
    ccc=[0]*(1006)
    a=list(map(int,input().split()))
    a=list(set(a))
    
    b=list(map(int,input().split()))
    b=list(set(b))
    count=0
    for i in range(len(a)):
        ccc[a[i]]+=1
        if ccc[a[i]]>1:
            count+=1
    for i in range(len(b)):
        ccc[b[i]]+=1
        if ccc[b[i]]>1:
            count+=1
    if count==0:
        print("NO")
    else:
        print("YES")
        for i in range(len(ccc)):
            if ccc[i]==2:
        
                break
        print(1,i)
        
        
    
    
     