The Most Wanted Letter

The Most Wanted Letter

Elementary+
DE EL EN ES FR HU 日本語 PL PT-BR RU UK ZH-HANS

あなたは英字と記号を含むテキストが与えられます。 このテキストの中で最も出現頻度の高い文字を見つけなければいけません。 文字は小文字で返さなければいけません。
最も求められている文字を検査している最中、大文字と小文字は区別しません。 つまり、検索の目的については"A" == "a"ということです。 記号、数字、空白は数えないことに注意してください。文字だけです。

example

もし二文字以上が同じ頻度のときは、アルファベットで最初にくる文字を返します。 例えば、"ONE"は"o", "n", "e"を各一個含んでいて、我々は"e"を選びます。

入力: 解析したいテキスト、文字列.

出力: 一番多い文字の小文字、文字列

例:

assert.strictEqual(mostWanted("Hello World!"), "l");
assert.strictEqual(mostWanted("How...
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