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Question

I m unable to write code on solo learn. Previous letter is erased automatically

Answer 1

I will assume that you are using pc version. You probably switched to Overtype mode. To solve this, press INSERT button on your keyboard.
Here's more info:
https://en.m.wikipedia.org/wiki/Insert_key

If this happens on app, then maybe your code has huge number of lines so it will lag. It also depends on which phone you are using. It happened to me long time ago.