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

n = int(input())
for i in range(n):
    a,b= map(int,input().split())
    c= map(int,input().split())
    x = list(c)
    d =map(int,input().split())
    y=list(d)
    lis=[]
    if a<=b:
        for i in range(a):
            for j in range(b):
                if x[i]==y[j]:
                    lis.append(x[i])
                else:
                    pass  
        if len(lis)>0:
            print("YES",lis[0])
        else:
            print("NO")                  
    elif b<a:
        for i in range(b):
            for j in range(a):
                if y[i]==x[j]:
                    lis.append(y[i])
                else:
                    pass             
        if len(lis)>0:
           print("YES",lis[0])
        else:
           print("NO")                         