use std::io::Read;
use std::collections::{HashSet, HashMap};

fn solve(ers: HashSet<String>, ees: HashSet<String>, ee_map: HashMap<String, usize>) {
    let mut result: Vec<(String, usize)> = ees.difference(&ers)
        .map(|name| (name.to_owned(), *(ee_map.get(name).unwrap())))
        .collect();
    result.sort_by_key(|r| r.1);
    result.iter().for_each(|pair| {
        println!("{}", pair.0);
    });
}

fn main() {
    let mut all_data = String::new();
    std::io::stdin().read_to_string(&mut all_data).ok();
    let all_data: Vec<&str> = all_data.trim().split('\n').map(|l| l.trim()).collect();
    let n: usize = all_data.iter().next().unwrap().parse::<usize>().unwrap();
    let mut ers: HashSet<String> = HashSet::new();
    let mut ees: HashSet<String> = HashSet::new();
    let mut ee_map: HashMap<String, usize> = HashMap::new();
    all_data.iter().skip(1).take(n).enumerate().for_each(|pair| {
        let er_ee: Vec<&str> = (pair.1).split_whitespace().collect();
        ers.insert(er_ee[0].to_string());
        ees.insert(er_ee[1].to_string());
        if !ee_map.contains_key(er_ee[1]) {
            ee_map.insert(er_ee[1].to_string(), pair.0);
        }
    });
    solve(ers, ees, ee_map);
}