Problem:
Score : 200 points

Problem Statement

Given are two strings S and T.

Let us change some of the characters in S so that T will be a substring of S.

At least how many characters do we need to change?

Here, a substring is a consecutive subsequence. For example, xxx is a substring of yxxxy, but not a substring of xxyxx.

Constraints

The lengths of S and T are each at least 1 and at most 1000.

The length of T is at most that of S.

S and T consist of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S
T

Output

Print the minimum number of characters in S that need to be changed.

Sample Input 1

cabacc
abc

Sample Output 1

1

For example, changing the fourth character a in S to c will match the second through fourth characters in S to T.

Since S itself does not have T as its substring, this number of changes - one - is the minimum needed.

Sample Input 2

codeforces
atcoder

Sample Output 2

6

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;

namespace QuestionB
{
    class Program
    {
        static void Main(string[] args)
        {
            var s = Console.ReadLine();
            var t = Console.ReadLine();

            var result = 0;
            for(int i = 0 ; i <= (s.Length - t.Length) ; i++)
            {
                var sliced = s.Substring(i,t.Length);
                var sameCharNum = CountSameChar(sliced,t);
                if(sameCharNum > result)
                {
                    result = sameCharNum;
                }
            }

            Console.WriteLine(t.Length - result);
        }

        static int CountSameChar(string a, string b)
        {
            var count = 0;
            for(int i=0; i < a.Length; i++)
            {
                if(a[i] == b[i])
                {
                    count++;
                }
            }
            return count;
        }
    }
}