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

t = int(input())
for i in range(t):
    n,m = map(int,input().split())
    arr1 = list(map(int,input().split()))
    arr2 = list(map(int,input().split()))
    d = {}
    for j in arr1:
        if j not in d:
            d[j] = 1
    flag = 0
    for j in arr2:
        if(j in d):
            flag = 1
            break
    if(flag==0):
        print("NO")
    else:
        print("YES")
        print(str(1)+" "+str(j))
