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

#Contest 1382    Round 658 div2
import sys
I = lambda : int(input())
readline = lambda: sys.stdin.readline().strip('\n')
readgen  = lambda: map(int,readline().split())


#A: Common subsequence
R = readgen
S = lambda: set(R())
for _ in range(I()):
    a,b = R()
    inter = S().intersection(S())
    if inter:
        print('YES\n%d'%inter.pop())
    else:
        print('NO')
