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(0,t):
    m,n=map(int,input().split())
    L1=list(map(int,input().split()))
    L2=list(map(int,input().split()))
    L3=[]
    count=0          
    for i in L1:
        if i in L2:
            L3.append(i)
            count=count+1
            break
    if count>0:
        print("YES")
        print(count,"",end="")
        for i in L3:
            print(i)
    else:
        print("NO")
        
            
