use std::io::Read;

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    
    let mut iter = buf.split_whitespace();
    
    let mut a: Vec<char> = iter.next().unwrap().chars().collect();
    let mut b: Vec<char> = iter.next().unwrap().chars().collect();
    
    a.sort();
    b.sort();
    
    let mut result = "YES";
    
    for i in 0..a.len() {
        if a[i] != b[i] {
            result = "NO";
        }
    }
    
    println!("{}", result);
}