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

for _ in range(int(input())):
    n,m = map(int,input().split(" "))
    a = list(map(int,input().split(" ")))
    b = list(map(int,input().split(" ")))
    c = []
    for i in range(n):
        if a[i] in b:
            c.append(a[i])
    #for j in range(len(c)-1):
        #if(a.index(c[j]) < a.index(c[j+1]) and b.index(c[j]) > b.index(c[j+1])):
            #c.remove(c[j+1])
    if(len(c) == 0):
        print('No')
    else:
        print("Yes")
        print(1,c[0])