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=input()
t=int(t)

while(t>0):
    n,m = input().split()
    n,m=int(n),int(m)
    a = list(map(int,input().strip().split()))[:n] 
    b = list(map(int,input().strip().split()))[:m]
    
    common = set(a)
    intersection = common.intersection(b)
    ans = list(intersection)
    if(len(ans)>0):
        print("YES")
        print("1" + " " + str(ans[0]))
    else:
        print("NO")
    
    t-=1 