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 = sys.stdin.readline
for f in range(int(input())):
    n,m = map(int,input().split())
    a = [int(x) for x in input().split()]
    b = [int(y) for y in input().split()]
    k = set(a).intersection(set(b))
    if(len(k)):
        print("YES")
        k = list(k)
        print(1,k[0])
    else:
        print("NO")