题面描述 给定一些字符串，求出它们的最长公共子串 输入格式 输入至多$10$ 行，每行包含不超过$100000$ 个的小写字母，表示一个字符串 输出格式 一个数，最长公共子串的长度 若不存在最长公共子串，请输出$0$ 。
A string is finite sequence of characters over a non-empty finite set Σ.
In this problem, Σ is the set of lowercase letters.
Substring, also called factor, is a consecutive sequence of characters occurrences at least once in a string.
Now your task is a bit harder, for some given strings, find the length of the longest common substring of them.
Here common substring means a substring of two or more strings.
The input contains at most 10 lines, each line consists of no more than 100000 lowercase letters, representing a string.输出格式：
The length of the longest common substring. If such string doesn't exist, print "0" instead.