Given a string, count all substrings of the given string.
First line contains string S.
Print the count of total substrings can form.
Step-1: Find the length of string
Step-2: Calculate total substrings value is length of string * (length of string +1)/2
For every Stirng:
There will be n substring of length 1
there will be n-1 substring of length 2
there will be 1 substring of length n
Total substrings are 1+2+3+...+n = n(n+1)/2
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