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 Mon Nov 16 12:40:49 2020

@author: DELL
"""

for i in range(int(input())):
    m , n = map(int , input().split())
    a = [int(a) for a in input().split()]
    b = [int(b) for b in input().split()]
    for i in b:
        if i in a:
            print('YES')
            print(1 , i)
            exit()

    
print('NO')