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

import sys
input = sys.stdin.readline

# input 


t = int(input())

# for looping 

for _ in range(t):
    n, m = map(int, input().split())
    
    # listing 
    
    nList = list(map(int, input().split()))
    mList = list(map(int, input().split()))


# boolean init 

    flag = False
    
    # for looping 
    
    for i in nList:
        if i in mList:
            
            # answer 
            
            print('YES')
            
            # 
            print(1, i)
            
            # bools
             
            flag = True
            break
        
        # else 0
    if flag == False:
        
        # answer 
        
        print('NO')