#![allow(non_snake_case, unused_imports, unused_must_use)]
use std::io::{self, prelude::*};
use std::str;

fn main() {
    let (stdin, stdout) = (io::stdin(), io::stdout());
    let mut scan = Scanner::new(stdin.lock());
    let mut out = io::BufWriter::new(stdout.lock());

    macro_rules! input {
        ($T: ty) => {
            scan.token::<$T>()
        };
        ($T: ty, $N: expr) => {
            (0..$N).map(|_| scan.token::<$T>()).collect::<Vec<_>>()
        };
    }

    let N = input!(usize);
    let P = input!(usize, N);

    let mut pos_to_val = std::collections::BTreeMap::new();

    for i in 0..N {
        pos_to_val.insert(i, P[i]);
    }

    let mut val_to_pos = std::collections::BTreeMap::new();

    for i in 0..N {
        val_to_pos.insert(P[i], i);
    }

    let mut hq = std::collections::BinaryHeap::new();

    for i in 0..N {
        hq.push(std::cmp::Reverse(P[i]));
    }

    let mut ans = vec![];

    while !hq.is_empty() {
        let m = hq.pop().unwrap().0;

        match val_to_pos.get(&m) {
            Some(&p1) => {
                if p1 == N - 1 {
                    continue;
                }

                match pos_to_val.range(p1 + 1..).next() {
                    Some((&p2, &v2)) => {
                        ans.push(m);
                        ans.push(v2);

                        pos_to_val.remove(&p1);
                        pos_to_val.remove(&p2);
                        val_to_pos.remove(&v2);
                        val_to_pos.remove(&m);
                    }
                    None => {
                        continue;
                    }
                }
            }
            None => {
                continue;
            }
        }
    }

    writeln!(
        out,
        "{}",
        ans.iter()
            .map(|x| x.to_string())
            .collect::<Vec<_>>()
            .join(" ")
    );
}

struct Scanner<R> {
    reader: R,
    buf_str: Vec<u8>,
    buf_iter: str::SplitWhitespace<'static>,
}
impl<R: BufRead> Scanner<R> {
    fn new(reader: R) -> Self {
        Self {
            reader,
            buf_str: vec![],
            buf_iter: "".split_whitespace(),
        }
    }
    fn token<T: str::FromStr>(&mut self) -> T {
        loop {
            if let Some(token) = self.buf_iter.next() {
                return token.parse().ok().expect("Failed parse");
            }
            self.buf_str.clear();
            self.reader
                .read_until(b'\n', &mut self.buf_str)
                .expect("Failed read");
            self.buf_iter = unsafe {
                let slice = str::from_utf8_unchecked(&self.buf_str);
                std::mem::transmute(slice.split_whitespace())
            }
        }
    }
}