I’m trying to find a USB-MIDI cable for my yamaha keyboard…?

First of all, I'm not sure how many pins it is(5 or 7). i think five, but the five pin cable looks too small, so I'm not certain. my keyboard is a yamaha ypt-310.
Secondly, if you know any reliable websites that sell USB-MIDI cables, fo not too much, please tell me!

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