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 = lambda: sys.stdin.readline().rstrip("\r\n")
Read = lambda: list(map(int, input().split()))
Num = lambda: int(input())


def solve():

    n, m = Read()
    a = Read()
    b = Read()
    for i in range(n):
        if a[i] in b:
            print("YES")
            print(1, a[i])
            return
    print("NO")


for _ in range(Num()):
    solve()
