[Python] Converting mobile numeric keypad numbers to its corresponding word Python

I need to create a function, where, If I give an input like 999933. It should give output as "ze". It basically work as numeric mobile phone keypad. How can I this. I have searched to get some sample in internet. All, I got was quite opposite. Like, Giving the text as input and you will get the number. I couldn't get the exact flow of, how to achieve that. Please let me know, how can i do that.

def number_to_text(val):

pass

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