How to compare string elements

How to compare letters of a single word in Appian:

Suppose,

We have to compare letters of word "Apple". The output should be:

1. Number of unique characters in word. In case of "Apple", it should be 4

2. Could of similar characters. Ex: In case of "Apple", A=1,p=2,l=1,e=1

Please provide code for this.

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