난이도: Easy문제 설명 You are given a string s. Your task is to remove all digits by doing this operation repeatedly:Delete the first digit and the closest non-digit character to its left.Return the resulting string after removing all digits. 문제 예제Example 1:Input: s = "abc"Output: "abc"Explanation:There is no digit in the string.Example 2:Input: s = "cb34"Output: ""Explanation:First, we apply the opera..