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;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AtCoder.Abc
{
    class QuestionB
    {
        public static void Main(string[] args)
        {
            var sw = new System.IO.StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            Console.SetOut(sw);

            string s = Console.ReadLine();
            string t = Console.ReadLine();

            long slen = s.Length;
            long tlen = t.Length;

            long result = tlen;
            long tempresult = 0;

            for (int i = 0; i <= slen-tlen; i++)
            {
                var st = s.Substring(i, (int)(tlen));
                //stとtの、重複具合を調べる
                for (int j = 0; j < tlen; j++)
                {
                    if (st[j] != t[j])
                    {
                        tempresult++;
                    }
                }

                if (tempresult < result)
                {
                    result = tempresult;
                }

                //debug
                //Console.WriteLine($"debug: i {i}, tempresult {tempresult}, result {result}, st {st}");

                tempresult = 0; //tempの初期化
            }


            Console.WriteLine(result);

            Console.Out.Flush();
        }

    }
}