'How to Add letters only to a sequence of numbers next to it in Excel

I hope you can help me with my problem. Here is what I want to do on my first column, I got a number to be input and I want that to be followed with a letter next to it in sequence. I hope it's possible

Example:

0111A
0111B  
0111C  when values are the same the letters are in sequence from a to z
0112A  and it will begin to "A" again when the value changes 
0112B
0113A
if-statement


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