Simple cell addressing issue searched long time

I need to ask user to input the row ("rowin") and column ("colin") address in order to activate a cell. The mose natural inputs from the user will be an integer for row and one or two alphbats for column. Say, for example, the user input (82, AY), how do I represent the cell in code? I know I want to say something like Range("AY82"). But I just could not figure out how to concatenate "colin" & "rowin" to make it AY82 to Excel.

I am new and spend quite a while to try to find an existing Q&A without a luck. If this is a dumb question, I appologize for wasting your time. But still would appreciate an answer.