Please, I need an application that can count the sentence characters and show how many times they were repeated
This sounds like a homework question 
Use the text manipulation blocks to get the length of the sentece.
Use the split by block to convert all the characters to a list then compare each character with an alphabet list and do some counting.
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This is a good place to use a dictionary, with values initially 0 and a key for each letter (a-z). As you scan each letter (segment text block or split at empty text) add 1 to the dictionary value for that letter.