Reno 19 1,4 RN. My car came out on the 5th gear.

Reno 19 1,4 RN. My car came out on the 5th gear. I throw it back in 5th gear after 100-200 meters. What is the problem and how much will you be happy if you help?

I had the same in my flash, the gear of the fifth gear was what it was like, they said what it was, I sold the car like that, but he said he would cost 200 liras