You are given two integers, l and r, represented as strings, and an integer b. Return the count of integers in the inclusive range [l, r] whose digits are in non-decreasing order when represented in base b.
An integer is considered to have non-decreasing digits if, when read from left to right (from the most significant digit to the least significant digit), each digit is greater than or equal to the previous one.
\n\nSince the answer may be too large, return it modulo 109 + 7.
\n
Example 1:
\n\nInput: l = "23", r = "28", b = 8
\n\nOutput: 3
\n\nExplanation:
\n\nExample 2:
\n\nInput: l = "2", r = "7", b = 2
\n\nOutput: 2
\n\nExplanation:
\n\n\n
Constraints:
\n\n1 <= l.length <= r.length <= 1002 <= b <= 10l and r consist only of digits.l is less than or equal to the value represented by r.l and r do not contain leading zeros.给你两个以字符串形式表示的整数 l 和 r，以及一个整数 b。返回在区间 [l, r] （闭区间）内，以 b 进制表示时，其每一位数字为 非递减 顺序的整数个数。
整数逐位 非递减 需要满足：当按从左到右（从最高有效位到最低有效位）读取时，每一位数字都大于或等于前一位数字。
\n\n由于答案可能非常大，请返回对 109 + 7 取余 后的结果。
\n\n
示例 1：
\n\n输入： l = \"23\", r = \"28\", b = 8
\n\n输出： 3
\n\n解释：
\n\n示例 2：
\n\n输入： l = \"2\", r = \"7\", b = 2
\n\n输出： 2
\n\n解释：
\n\n\n\n
提示：
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