use std::io::*;

fn main() {
  let s = stdin();
  let mut handle = s.lock();

  let mut buf = String::new();
  handle.read_line(&mut buf).ok();

  let mut a = buf.trim().as_bytes().to_vec();
  a.sort();

  buf.clear();
  handle.read_line(&mut buf).ok();
  let mut b = buf.trim().as_bytes().to_vec();
  b.sort();

  for i in 0..a.len() {
    if a[i] != b[i] {
      println!("NO");
      return;  
    }
  }
  println!("YES");
}