#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        let mut next = || { iter.next().unwrap() };
        input_inner!{next, $($r)*}
    };
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};

    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };

    ($next:expr, mut $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };

    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };

    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };

    ($next:expr, bytes) => {
        read_value!($next, String).into_bytes()
    };

    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
    };

    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}
fn main() {
    input!{
        n: usize,
        a: [i64; n]
    }
    let mut nvec = vec![];
    let mut pvec = vec![];
    let mut sum = 0;
    for i in 0..n {
        sum+=a[i].abs();
        if a[i]>=0 {
            pvec.push(a[i]);
        }else{
            nvec.push(a[i]);
        }
    }
    pvec.sort();
    nvec.sort();
    nvec.reverse();
    // println!("{:?}", nvec);
    if nvec.len()==0 && pvec.len()==2{
        println!("{}", pvec[1] - pvec[0]);
        println!("{} {}", pvec[1], pvec[0]);
    }else if nvec.len() >=1 && pvec.len() >=2{
        println!("{}", sum);
        println!("{} {}", nvec[0], pvec[0]);
        let mut dif = nvec[0] - pvec[0];
        for i in 1..(pvec.len() - 1) {
            println!("{} {}",  dif, pvec[i]);
            dif -=pvec[i];
        }
        println!("{} {}", pvec[pvec.len() - 1], dif);
        dif = pvec[pvec.len() - 1] - dif;
        for i in 1..nvec.len() {
            println!("{} {}", dif, nvec[i]);
            dif -=nvec[i];
        }
    }else if nvec.len() >=1 && pvec.len() ==1 {
        let mut dif = pvec[0] - nvec[0];
        println!("{}", sum);
        println!("{} {}", pvec[0], nvec[0]);
        for i in 1..nvec.len() {
            println!("{} {}", dif, nvec[i]);
            dif-=nvec[i];
        }
        // assert!(true);
    }else if nvec.len() >=1 && pvec.len() ==0 {
        let mut dif = nvec[0] - nvec[1];
        println!("{}", sum + nvec[0]*2);
        println!("{} {}", nvec[0], nvec[1]);
        for i in 2..nvec.len() {
            println!("{} {}", dif, nvec[i]);
            dif-=nvec[i];
        }
    }else{
        
        let mut dif = pvec[0] - pvec[1];
        println!("{}", sum - 2*pvec[0]);
        println!("{} {}", pvec[0], pvec[1]);
        for i in 2..(pvec.len()-1) {
            println!("{} {}", dif, pvec[i]);
            dif-=pvec[i];
        }
        println!("{} {}", pvec[pvec.len() - 1], dif);
    }
}

Measured memory_bytes: 8060