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

a = int(input())
i = 0
while i < a :
    b = input().split(" ")
    c = input().split(" ")
    d = input().split(" ")
    def common_elements(c, d):
        c.sort()
        d.sort()
        i, j = 0, 0
        common = []
        while i < len(c) and j < len(d):
            if c[i] == d[j]:
                common.append(c[i])
                break
                i += 1
                j += 1
            elif c[i] < d[j]:
                i += 1
            else:
                j += 1
        return common
    if (common_elements(c , d)) == [] :
        print("NO")
    else:
        print("YES")
        print(1 , ', '.join(map(str, common_elements(c , d))))
    i = i + 1