How to “pick” which stock to sell for long term capital gains

So let's say I buy stock X at the beginning of the year and buy the same stock again in the middle of the year. Fast forward one year exactly a few days after I bought
my first share. Now I want to sell the stock that I bought at the beginning of the year since I'll have to pay less taxes on it and not the one I bought in the middle of the
year. Can I pick specifically which share I want to sell? How would I do this. I use fidelity of that matters thanks!