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: Wrong Answer)

// -*- coding:utf-8-unix -*-

use proconio::input;

fn main() {
    input! {
        s: String,
        t: String,
    }

    let vs: Vec<char> = s.chars().collect();
    let vt: Vec<char> = t.chars().collect();
    let mut saved = 0;
    for i in 0..vs.len() {
        let mut current = 0;
        // println!("i: {}", i);
        for j in 0..vt.len() {
            // println!("j: {}", j);
            if i + j >= vt.len() {
                continue;
            }

            if vs[i + j] == vt[j] {
                current += 1;
            } else {
                continue;
            }
        }
        // println!("streak: {}", current);
        saved = saved.max(current);
    }
    println!("{}", vt.len() - saved);
}