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import java.util.*;

/**
 * https://leetcode.cn/problems/word-ladder/
 * 
 * :
 *  wordList  beginWord  endWord    beginWord -> s1 -> s2 -> ... -> sk
 * - 
 * -  1  "dot" -> "dog" -> "cog",  5
 * 
 *  2
 * beginWord = "hit", endWord = "cog", wordList = ["hot","dot","dog","lot","log"]
 * 0
 * endWord "cog" 
 * 
 * 
 * - 1
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