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 Rust (1.42.0) (judge verdict: Accepted)

/**
 *    author : HikaruEgashira
 *    created: 08.29.2020 21:03:00
**/
use proconio::input;
use proconio::marker::Chars;

#[proconio::fastout]
fn main() {
    input! {
        s: Chars,
        t: Chars,
    }

    let (s, t): (Vec<char>, Vec<char>) = (s, t);

    let res = s
        .windows(t.len())
        .map(|a| a.iter().enumerate().filter(|&(i, &ai)| ai != t[i]).count())
        .min()
        .unwrap_or(t.len());

    println!("{}", res);
}