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;

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

        var sLength = s.Length;
        var tLength = t.Length;

        var ans = tLength;
        var pos = 0;
        while (pos + tLength <= sLength)
        {
            var current = s.Substring(pos, tLength);

            var match = 0;
            for (int i = 0; i < tLength; i++)
            {
                if (current[i].Equals(t[i]))
                    match++;
            }

            if (ans > tLength - match)
                ans = tLength - match;

            pos++;
        }

        Console.WriteLine(ans);
    }
}