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

import sys
inp=sys.stdin.readline

def linp(x):
    return list(map(int,x.split()))
def minp(x):
    return map(int,x.split())

def main():
    for _ in range(int(inp())):
        n,m=minp(inp())
        nl = linp(inp())
        ml =linp(inp())
        for i in nl:
            if i in ml:
                print("YES")
                print("1",i)
                break
        else:
            print("NO")
    
main()
