A $3-$character string, userString, is read from input. Check if the first and second characters in userString are alphabetic characters. Replace the alphabetic characters $($if any$)$ with $\text{'}.\text{'}.$ If neither character is alphabetic, userString is not changed. Ex: If the input is ps $8,$ then the output is:

$8$

Ex: If the input is $k9p,$ then the output is:

$9p$

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