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 PyPy3 (7.3.0) (judge verdict: Accepted)

def main():
    target = input()
    source = input()
    diff = len(target) - len(source)
    max_change = len(source)
    for i in range(diff+1):
        temp = target[i:len(target)-diff+i]
        change = sum([1 for t, s in zip(temp, source) if(t!=s)])
        if(change < max_change):
            max_change = change
    print(max_change)
if __name__ == '__main__':
    main()