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

from sys import stdin
input = stdin.readline

lines = int(input())

for i in range(lines):
    a,b = (map(int, input().split()))
    x = list(map(int, input().split()))
    y = list(map(int, input().split()))
    
    if len(x) == 1 and len(y)==1 and x[0] != y[0]:
        print("NO")
    else:
        for j in range(a):
            if x[j] in y:
                print("YES")
                print("1 ", x[j])
                break
        print("YES")
        print(x[0], y[0], sep=" ")