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, print =  sys.stdin.readline, sys.stdout.write
if __name__== "__main__":
    for _ in range(int(input())):
        n, m = map(int, input().split())
        a = set(list(map(int, input().split())))
        b = set(list(map(int, input().split())))
        c = list(a.intersection(b))
        if c:
            print("YES"+'\n')
            print(str(1) + " " + str(c[0]) + '\n')
        else:
            print("NO"+'\n')