Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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A sandwich string is a string with length of at least three, the first and last character are equal, and the characters in the middle are all the same but not equal to the first and last character. wooow is an example of a sandwich string.

Make a python (py3) program that asks for a user input string S, and prints the list of sandwich strings found in S. The list should be in alphabetical order as well.

 

For example,

Input is:

qhadaaadwq

Output will be:

['ada', 'daaad']

Other examples:

Input:

poooop

Output will be:

['poooop']

Input:

ahaaadahah

Output will be:

['ada', 'aha', 'hah']

Input:

science

Output will be:

[]

 

 

 

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