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 Go (1.14.1) (judge verdict: Wrong Answer)

package main

import (
	"fmt"
	"math"
	"strings"
)

func main() {
	// Code for B - Substring
	var S, T string
	fmt.Scanf("%s", &S)
	fmt.Scanf("%s", &T)

	var num1 int = -1
	var A int
	var flag1 int = 0
	for i := 0; i < len(T); i++ {
		A = strings.Index(S, T[0:len(T)-i])
		for {
			//	for j:=0;j<len(S);j++{

			//fmt.Println(A, T[0:len(T)-i])
			if A != -1 && len(S) >= A+len(T) {
				num1 = i
				flag1 = 1
				break
			}

			if A == -1 {
				break
			} else {
				A = strings.Index(S[A+1:len(S)], T[0:len(T)-i])
			}
		}

		if flag1 == 1 {
			break
		}
	}
	//fmt.Println(num1)

	var num2 int = -1
	var B int
	var flag2 int = 0
	for i := 0; i < len(T); i++ {
		B = strings.Index(S, T[i:len(T)])
		//fmt.Println(B, T[i:len(T)])
		for {
			if B != -1 && B+1 >= len(T) {
				num2 = i
				flag2 = 1
				break
			}
			if B == -1 {
				break
			} else {
				B = strings.Index(S[B+1:len(S)], T[i:len(T)])
			}
		}
		if flag2 == 1 {
			break
		}
	}
	//fmt.Println(num2)

	if num1 == -1 && num2 == -1 {
		fmt.Println(len(T))
	} else {
		if num1 == -1 && num2 != -1 {
			fmt.Println(num2)
		} else if num1 != -1 && num2 == -1 {
			fmt.Println(num1)
		} else {
			C := int(math.Min(float64(num1), float64(num2)))
			fmt.Println(C)
		}
	}
}