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

from itertools import combinations
from collections import defaultdict as D
try:
    t=int(input())
    for i in range(t):
        flag=0
        n,m=map(int,input().split())
        l1=list(map(int,input().split()))
        l2=list(map(int,input().split()))
        for i in l1:
            if i in l2:
                a=i
                flag=1
                break
        if(flag==1):
            print("YES")
            print(1,a)
        else:
            print("NO")
except:
    pass
