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: Runtime Error)

using System;
using System.Linq;
using System.Collections.Generic;
namespace Sample
{
  class Sample
  {
    static void Main(string[] args)
    {
    string S=Console.ReadLine();
    string T=Console.ReadLine();
         int tmp=-1;
      
      for(int i=0;i<T.Length;i++){
     
        int index=S.IndexOf(T.Substring(0,i));
        if(index==-1){
          break;
        }else{
          if(tmp<index){
            tmp=index;
          }         
      }
      }
      if(tmp==-1){
        Console.WriteLine(T.Length);
      }else{
      string subS=S.Substring(tmp,T.Length);
      
      int ans=0;
      for(int i=0;i<T.Length;i++){
       if(subS.Substring(i,1)!=T.Substring(i,1)){
         ans++;
       }
      }
      Console.WriteLine(ans);
      }
    }
    
  }

}