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

# -*- coding: utf-8 -*-
"""
Created on Sun Aug 23 23:56:29 2020
1382B Common Subsequence
@author: RACHIT
"""

if __name__=="__main__":
    t=int(input())
    while(t):
        m,n=map(int,input().split())
        a=[int(x) for x in input().split()]
        b=[int(x) for x in input().split()]
        ans=[]
        for i in a:
            if i in b:
                ans.append(i)
        if ans==[]:
            print("NO")
        else:
            print('YES')
            print(len(ans),end=' ')
            for i  in ans:
                print(i,end=' ')
        t-=1