Alice and Bob are playing a game. Initially, Alice has a string word = "a".
You are given a positive integer k.
Now Bob will ask Alice to perform the following operation forever:
\n\nword to its next character in the English alphabet, and append it to the original word.For example, performing the operation on "c" generates "cd" and performing the operation on "zb" generates "zbac".
Return the value of the kth character in word, after enough operations have been done for word to have at least k characters.
\n
Example 1:
\n\nInput: k = 5
\n\nOutput: "b"
\n\nExplanation:
\n\nInitially, word = "a". We need to do the operation three times:
"b", word becomes "ab"."bc", word becomes "abbc"."bccd", word becomes "abbcbccd".Example 2:
\n\nInput: k = 10
\n\nOutput: "c"
\n\n
Constraints:
\n\n1 <= k <= 500Alice 和 Bob 正在玩一个游戏。最初，Alice 有一个字符串 word = \"a\"。
给定一个正整数 k。
现在 Bob 会要求 Alice 执行以下操作 无限次 :
\n\nword 中的每个字符 更改 为英文字母表中的 下一个 字符来生成一个新字符串，并将其 追加 到原始的 word。例如，对 \"c\" 进行操作生成 \"cd\"，对 \"zb\" 进行操作生成 \"zbac\"。
在执行足够多的操作后， word 中 至少 存在 k 个字符，此时返回 word 中第 k 个字符的值。
\n\n
示例 1:
\n\n输入：k = 5
\n\n输出：\"b\"
\n\n解释：
\n\n最初，word = \"a\"。需要进行三次操作:
\"b\"，word 变为 \"ab\"。\"bc\"，word 变为 \"abbc\"。\"bccd\"，word 变为 \"abbcbccd\"。示例 2:
\n\n输入：k = 10
\n\n输出：\"c\"
\n\n\n
提示：
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