How to file taxes if the stock ticker symbol change due to merger ?

Lets say, I bought 100 stocks of stock A at $10 each. So total investment of $1000
Due to company's merger, the stock symbol change from A to B
 Now, in my Robinhood account, it shows that I have 100 stocks of company B which is priced at same $10 per share.

So, if I sell these 100 stocks of company B now, how will I be reporting this sale ?