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

def inp():
    return(int(input()))
def insr():
    s = input()
    return s
def inlt():
    return(list(map(int,input().split())))

if __name__ == "__main__":
    r=inp()
    for i in range(r):
        l2=inlt()
        p1=inlt()
        p2=inlt()
        a=list(set(p1).intersection(set(p2)))
        if len(a)>0:
            print("YES\n")
            print("1 "+str(a[0])+"\n")
        else:
            print("NO\n")
    