Problem:
Score : 200 points

Problem Statement

Find the number of palindromic numbers among the integers between A and B (inclusive).
Here, a palindromic number is a positive integer whose string representation in base 10 (without leading zeros) reads the same forward and backward.

Constraints

10000 \leq A \leq B \leq 99999

All input values are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the number of palindromic numbers among the integers between A and B (inclusive).

Sample Input 1

11009 11332

Sample Output 1

4

There are four integers that satisfy the conditions: 11011, 11111, 11211 and 11311.

Sample Input 2

31415 92653

Sample Output 2

612

Solution in Rust (1.15.1) (judge verdict: Accepted)

#[allow(unused_macros)]
macro_rules! invec {
    ( $t:ty ) => {{
        let mut s = String::new();
        match std::io::stdin().read_line(&mut s) {
            Ok(0) => Vec::<$t>::new(),
            Ok(n) => s.trim().split_whitespace().map(|s| s.parse::<$t>().unwrap()).collect::<Vec<$t>>(),
            Err(_) => Vec::<$t>::new(),
        }
    }}
}

#[allow(unused_macros)]
macro_rules! input {
    ( $($t:ty),* ) => {{
        let mut s = String::new();
        std::io::stdin().read_line(&mut s);
        let mut splits = s.trim().split_whitespace();
        ($(
            {
                 splits.next().unwrap().parse::<$t>().unwrap()
            },
        )*)
    }}
}

fn is_palindrome(s: &str) -> bool {
    let v: Vec<char> = s.chars().collect();
    for i in 0..(s.len() / 2) as usize {
        if v[i] != v[s.len() - i - 1] {
            return false;
        }
    }

    return true;
}

#[allow(unused_must_use)]
#[allow(unused_variables)]
fn solve() {
    let (a, b) = input!(usize, usize);

    let mut cnt = 0;
    for n in a..(b+1) {
        let s = &(n.to_string());
        if is_palindrome(s) {
            cnt += 1
        }
    }

        // let n = (a..(b+1)).map(|s| &(s.to_string())).filter(is_palindrome).len();

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

fn main() {
    solve();
}