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

# -*- coding: utf-8 -*-
"""
Created on Wed Jul  8 16:37:05 2020

@author: Pooja Patidar
"""

for _ in range(int(input())):
    n,m=map(int,input().split())
    a=list(map(int,input().split()[:n]))
    b=list(map(int,input().split()[:m]))
    count=0
    for i in a:
        for j in b:
            if i==j:
                count+=1
    if count==0:
        print("NO")
    else:
        print("YES")
        print(1,i)
        