$2\mathrm{.}7\mathrm{.}2$: Alphabetic replace.

Replace any alphabetic character with $\text{'}\_\text{'}$ in $2-$character string passCode. Ex: If passCode is $"9$a$",$ output is:

$9\_$

Hint: Use two if statements to check each of the two characters in the string, using isalpha$().$

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