WC '18 Finals J2 - Script Doctor

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Points: 5 (partial)
Time limit: 1.0s
Memory limit: 16M

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Problem type
Woburn Challenge 2018-19 Finals Round - Junior Division

The Head Monkey has just completed her first draft of the film script, and has proudly passed it on to Bo Vine for a readthrough. Unfortunately, Bo has concerns that coarse language in the script might cause the movie to end up with an R rating, which would be a disaster! In order to secure exposure of the movie to younger audiences, he'd like to take a pass over the script himself to ensure that it contains no occurrences of a particularly offensive word: bull.

The script is a non-empty string S consisting of at most 1\,000 characters, each of which is either a lowercase letter (a to z) or an underscore (_). Bo Vine would like to alter it as little as possible such that, once he's done, the string contains no occurrences of the substring bull. Now, he's not a writer, so he doesn't feel qualified to add anything to the script to accomplish his goal- he'll only remove existing characters from it.

Help Bo Vine remove as few characters as possible from S to yield a string with no occurrences of the substring bull. If there are multiple ways to do so, any will do. It's possible that no characters may need to be removed.

Input Specification

The first and only line of input consists of a single string, S.

Output Specification

Output a single string, any maximum-length cut-down version of S with no occurrences of bull.

Sample Input

the_bull_was_feeling_bulllish

Sample Output

the_bul_was_feeling_ulllish

Sample Explanation

Upon removing two characters (the 7th one, l, and the 22nd one, b), the resulting string no longer contains bull. It's impossible to achieve this by only removing one character. Note that multiple other outputs with two removed characters would also be accepted.


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