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())):
    n1,n2=map(int,input().split())
    a=list(map(int,input().split()))
    b=list(map(int,input().split()))
    x=[]
    for i in a:
        if i in b:
            x.append(i)
    print(*(["NO"],["YES\n"+str(len(x)),*set(x)])[len(x)>0])

# 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

# YES
# 1 4
# YES
# 1 3
# NO
# YES
# 1 3
# YES
# 1 2

