Problem:
Score : 100 points

Problem Statement

You are given a three-digit positive integer N.

Determine whether N is a palindromic number.

Here, a palindromic number is an integer that reads the same backward as forward in decimal notation.

Constraints

100≤N≤999

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

If N is a palindromic number, print Yes; otherwise, print No.

Sample Input 1

575

Sample Output 1

Yes

N=575 is also 575 when read backward, so it is a palindromic number. You should print Yes.

Sample Input 2

123

Sample Output 2

No

N=123 becomes 321 when read backward, so it is not a palindromic number. You should print No.

Sample Input 3

812

Sample Output 3

No

Solution in Rust (1.15.1) (judge verdict: Runtime Error)

use std::io;

fn gets() -> String {
    let mut buf = String::new();
    io::stdin().read_line(&mut buf).ok();
    return buf
}

fn main() {
    let line = gets();
    let mut it = line.split_whitespace().map(|n| n.parse::<i64>().unwrap());
    let (a, b, c, d) = (it.next().unwrap(), it.next().unwrap(), it.next().unwrap(), it.next().unwrap());
    if b < c || d < a {
        println!("{}", 0);
    } else if a <= c && d <= b {
        println!("{}", d - c);
    } else if a <= c && c <= b {
        println!("{}", b - c);
    } else if c <= a && b <= d {
        println!("{}", b - a);
    }
}