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 math
######################################################
# ps template
def mi(): return map(int, input().split())
def ii(): return int(input())
def li(): return list(map(int, input().split()))
def si(): return input().split()

#######################################################
t = ii()
for _ in range(t):
    n, m = mi()
    a = li()
    b = li()
    dic_a = {}
    for i in range(n):
        if dic_a.get(a[i]):
            dic_a[a[i]]+=1
        else:
            dic_a[a[i]] = 1
    for i in range(m):
        if dic_a.get(b[i]):
            print("YES")
            print(1,b[i])
            break
    else:
        print("NO")