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 random

#FUNGSI BUAT NGECEK ADA ELEMEN SAMA NGGAK
hasil = []

def elemensama(arr1,arr2):
    global hasil
    sama = []
    found = False
    for data1 in arr1:
        for data2 in arr2:
            if data1==data2:
                found = True
                sama += [data1]
    if found == True:
        x = random.choice(sama)
        hasil += ['YES']
        hasil += ['1 '+str(x)]
    else:
        hasil += ['NO']


t = int(input())



for i in range(t):
    len = input().split(' ')
    Tab_a = input().split(' ')
    Tab_b = input().split(' ')

    elemensama(Tab_a,Tab_b)

for row in hasil:
    print(row)