letter translator (or someting)

[Obsilion]

i'm trying to make a translator (i'm not sure that's called translator) that changes every letter to it's equivalent in it's alternative version(for example a=o). i wrote something but it's not working.

Alp1 = "abcdefghıjklmnoprstuvyzxqwABCDEFGHIJKLMNOPRSTUVYZXQW"
Alp2 = "ozskadcmufvhpnebtgyijrlxwqOZSKADCMUFVHPNEBTGYİJRLXWQ"


def variable(word,Num1=0, Num2=0,):
    while Num2 != len(word) + 1:
        Num1 = 0
        Num2 += 1
        while word[Num2] != Alp1[Num1]:
            Num1 += 1
        word[Num2] = Alp2[Num1]
        return word


print(variable(input("enter the word:")))

what do i do?