What program to denoise the photo?

I have a picture taken with a digital camera, but the longer exposure time caused noise. I have not turned on the noise canceling function on the camera. The scene in the picture is nice, and I can't repeat the shot. I thought that I would take a second photo with the same settings, but with the lens closed and with the help of the program it would be possible to subtract these noises. Only what?

I have a picture taken with a digital camera, but the longer exposure time caused noise. I have not turned on the noise canceling function on the camera. The scene in the picture is nice, and I can't repeat the shot. I thought that I would take a second photo with the same settings, but with the lens closed and with the help of the program it would be possible to subtract these noises. Only what?

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