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

# from collections import defaultdict

rr = lambda: input()
rri = lambda: int(input())
rrm = lambda: list(map(int, input().split()))

INF=float('inf')
YES, NO="YES", "NO"


def solve(N,M,A,B):
	C = set(A) & set(B)
	if len(C) > 0:
		print(YES)
		first = -1
		for v in C:
			first = v
			break
		print(1, first)
	else:
		print(NO)

t = rri()
for _ in range(t):
	N,M=rrm()
	A=rrm()
	B=rrm()
	solve(N,M,A,B)
