Replace First Character in a String

[Patrick-B]

I have a list of numbers (room numbers in this case) where I want to change the first character of each item regardless of what that character is.

In this case change the 5 to another number:

I don’t want to search for a number, as it might be elsewhere in the string, but instead always replace the first character of the string.

Any thoughts?

[john_pierson]

[Nico_Stegeman]

[Patrick-B]

Thank you!