Question: Given string userString on one line, character updatedLetter on a second line, and integer strIndex on a third line, change the character at index strIndex

Given string userString on one line, character updatedLetter on a second line, and integer strIndex on a third line, change the character at index strIndex of userString to updatedLetter.
Ex: If the input is:
gecko
f
2
then the output is:
gefko
Note: Assume the length of string userString is greater than strIndex.

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