use std::io::Read;

fn run() {
    let mut s = String::new();
    std::io::stdin().read_to_string(&mut s).unwrap();
    let mut it = s.trim().split_whitespace();
    let n: usize = it.next().unwrap().parse().unwrap();
    let mut a = Vec::with_capacity(n);
    let mut sum = 0;
    for _ in 0..n {
        let p: usize = it.next().unwrap().parse().unwrap();
        sum += p;
        let mut b: Vec<u32> = (0..p).map(|_| it.next().unwrap().parse().unwrap()).collect();
        b.sort();
        b.reverse();
        a.push(b);
    }
    let mut ans = String::new();
    while sum > 0 {
        for a in &mut a {
            if let Some(v) = a.pop() {
                ans.push_str(&format!("{} ", v));
                sum -= 1;
            }
        }
    }
    ans.pop();
    println!("{}", ans);
}

fn main() {
    run();
}