1. If trademark "A" is a legal trademark that has been registered by someone else and has obtained a trademark certificate, then you have infringed on the other party's trademark rights. If the other party sues and you fail to use prior evidence, it will be very detrimental to you.

2. If the trademark "A" has not been registered by any company or individual, you should register it immediately, which is beneficial to the company's brand building.

3. If the trademark "A" has been accepted by the Trademark Office but no trademark certificate has been issued, you can object to the trademark and fight for trademark rights.