One day you heard the following joke
In America, you write strings.
In Soviet Russia, String writes YOU!! 1
And find that now string is writting you! So to get rid of it, you must solve the following problem:
Given a string S and its four substring a,b,c, and d. In a configuration, you can place four substrings exactly one position it occurs in S (they may overlap), and characters covered by at least one such substring is called “covered”.
You should solve for minimum and maximum possible number of covered characters in a configuration.
You may assume that s contains only lowercase letters, and is of length less than 4096. However, lengths of a,b,c, and d would never exceed 64.
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1An infamous Russian reversal