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


t = int(input())
dict = {}
for i in range(t):
    
    numm = str(input()).split(' ')
    nn = str(input()).split(' ')
    mm = str(input()).split(' ')
    dict[i] = nn,mm
stop = 0

for key in dict.keys():
    for j in range(len(dict[key][0])):
        for k in range(len(dict[key][1])):
            if dict[key][0][j] == dict[key][1][k]:
                print("YES")
                print("1", dict[key][0][j])
                stop = 1
                break
        if stop == 1:
            
            break
    if stop == 0:
       print("NO") 
    stop = 0
        
