#![allow(unused_imports)]
#![allow(non_snake_case)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let n = read::<usize>();
    let mut v = vec![];
    for i in 0..n {
        let vv = read_vec::<usize>();
        let vv = vv.into_iter().skip(1).collect::<VecDeque<_>>();
        v.push(vv);
    }
    let mut answers = vec![];
    let mut prev_len = 0;
    loop {
        for i in 0..n {
            if let Some(lead) = v[i].pop_front() {
                answers.push(lead);
            }
        }
        if prev_len == answers.len() {
            break;
        }
        prev_len = answers.len();
    }
    print_array(&answers);
}

fn print_array<T: std::string::ToString>(array: &Vec<T>) {
    println!(
        "{}",
        array
            .iter()
            .map(|ref x| x.to_string())
            .collect::<Vec<_>>()
            .join(" ")
    );
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}