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 (GCC 9.2.1) (judge verdict: Runtime Error)

#include <stdio.h>
#include <string.h>

int main (void) 
{
    char s[1001];
    char t[1001];
    char buff[1000+1];
    int num[1000+1];
    int n = 0;
    int i, j, k;
    int min;
    int s_len;
    int t_len;

    scanf("%s", s);
    scanf("%s", t);
    s_len = strlen(s);
    t_len = strlen(t);

    for (i = 0; i < s_len-t_len; i++) {
        for (j = 0; j < t_len; j++) {
            if (s[i+j] == t[j]) {
                strncpy(buff, s+i, i+t_len);
                n++;
                num[n] = 0;
                for (k = 0; k < t_len; k++) {
                    if (buff[k] != t[k]) {
                        num[n] = num[n] + 1;
                    }
                }
                
            }
        }
    }
    min = num[0];
    for (i = 0; i < n; i++) {
        if (min > num[i]) {
            min = num[i];
        }
    }
    printf("%d", min);

    
    return 0;
}