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
inputlist=sys.stdin.readlines()
number_of_testcases=int(inputlist[0])
for i in range(number_of_testcases):
    n,m=list(map(int,inputlist[3*i+1].strip().split(' ')))
    #print(n,m)
    firstlist=list(map(int,inputlist[3*i+2].strip().split(' ')))
    secondlist=list(map(int,inputlist[3*i+3].strip().split(' ')))
    #print(firstlist)
    #print(secondlist)
    for j in firstlist:
        if j in secondlist:
            print('YES')
            print('1',j)
            break
    else:
        print('NO')