use std::io::{self, BufRead};

fn main() {
    let stdin = io::stdin();
    let mut lines = stdin.lock().lines();
    let line = lines.next().unwrap().unwrap();
    let mut iter = line.split_whitespace();

    // is_palindrome function
    pub fn is_palindrome(s: &str) -> bool {
        s.chars().rev().collect::<String>() == s
    }

    // input string
    let s = iter.next().unwrap();
    let s = s.to_string();

    // if s is palindrome, print s, else print s+reverse(s)
    if is_palindrome(&s) {
        println!("{}", s);
    } else {
        println!("{}{}", s, s.chars().rev().collect::<String>());
    }
}