Thread Subject: Emulating Find by using Explicit Looping

So I want to write a function that will display the number of time each letter of the alphabet appear in a given vector composed of random numbers. I am trying to do this using the for/while loop commands and I do not wish to use the findstr or histogram built-in functions. I am not sure how to approach this; could somebody please lean me towards the right direction. I guess I should assign for to a given interval 1:26 and then use if to see if the letter appears as the interval is run through.

Thanks!