We saw how to access individual characters of a string with []. It’s also possible to select a specific slice of a string - take several consecutive characters. This can be accomplished with the same [] brackets but by providing two numbers - the start and the end of the selection:
s = 'This is a long long string'
print(s[0: 1])      # T
print(s[0: 2])      # Th
print(s[0: 18])     # This is a long lon
print(s[1: 3])      # hi
print(s[1: -1])     # his is a long long strin
print(s[3: -2])     # s is a long long stri
print(s[-10: -2])   # ong stri
Note 1: The start is always inclusive and the end is always exclusive ⇒ [start; end).
Note 2: Both start and end can be negative - implying negative indexing.


We should like to know what’s the central segment of a string.
Given a string of length n, we would like to see the letters that span the positions from n/4 to 3n/4.
The input contains a single line of text, which is guaranteed to have a length divisible by 4.
The program should print the central segment.


Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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