use itertools::Itertools;
use proconio::{input, marker::Chars};

fn main() {
    input! {
        s: Chars,
    }

    let a = s.iter().filter(|&&x| x.is_alphabetic()).rev().collect_vec();
    let b = s.iter().filter(|&&x| x.is_numeric()).collect_vec();
    println!("{}", [a, b].concat().iter().join(""));
}