Count number of characters

Hello, 

I have a column with IDs that either have X, either have Y number of characters. The characters are a combination between letters and numbers. I would now need to find a way to single out all the IDs with X number of characters. 

I was thinking of creating a 2nd column that gives me 1 if the column has X characters, 0 if Y characters. However, I am struggling to find a way how to count. Is this possible? 

Thank you very much in advance