Let the string be .
Hint 1
Hint 2
Hint 3
Hint 4
Solution 1
Solution 2
Solution 3
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Let the string be .
Hint 1
Hint 2
Hint 3
Hint 4
Solution 1
Solution 2
Solution 3
Stuck on a problem, or don't understand a module? Join the USACO Forum and get help from other competitive programmers!