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 i in range(int(input())):
    a=list(map(int,input().strip().split()))[:2]
    b=list(map(int,input().strip().split()))[:a[0]]
    c=list(map(int,input().strip().split()))[:a[1]]
    e=set(b)
    f=set(c)
    g=list(e.intersection(f))
    if len(g)!=0:
        print("YES")
        print(str(1)+" "+str(g[0]))
    else:
        print("NO")