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

fn main() {
    let (stdin, stdout) = (io::read_to_string(io::stdin()).unwrap(), io::stdout());
    let (mut stdin, mut buffer) = (stdin.split_whitespace(), io::BufWriter::new(stdout.lock()));
    macro_rules! input {
        ($t: ty, $n: expr) => {
            (0..$n).map(|_| input!($t)).collect::<Vec<_>>()
        };
        ($t: ty) => {
            stdin.next().unwrap().parse::<$t>().unwrap()
        };
    }

    let mut X = input!(u64);

    if X == 1 {
        writeln!(buffer, "2\n1 2\nb g");
        return;
    }

    let mut childs = vec![];
    let mut cnt = 0;

    for p in 2.. {
        if p * p > X {
            break;
        }

        if X % p != 0 {
            continue;
        }

        if p + 1 + cnt > 200_000 {
            writeln!(buffer, "-1");
            return;
        }

        let mut e = 0;

        while X % p == 0 {
            e += 1;
            X /= p;
        }

        let mut c = 1;

        for _ in 0..e / 2 {
            c *= p;
        }

        if e == 1 {
            childs.push(p);
            cnt += p + 1;
            continue;
        }

        if e % 2 == 1 {
            childs.push(c);
            childs.push(c);
            childs.push(p);
            cnt += 2 * c + p + 3;
        } else {
            childs.push(c);
            childs.push(c);
            cnt += 2 * c + 2;
        }
    }

    if X != 1 {
        childs.push(X);
        cnt += X + 1;
    }

    if cnt > 200_000 {
        writeln!(buffer, "-1");
        return;
    }

    writeln!(buffer, "{}", cnt);

    let mut is_brown = vec![false; cnt as usize];

    for i in 0..childs.len() {
        is_brown[i] = true;
    }

    for i in 0..childs.len() - 1 {
        writeln!(buffer, "{} {}", i + 1, i + 2);
    }

    let mut r = 0;
    let mut cur = childs.len();

    for c in childs {
        for _ in 0..c {
            writeln!(buffer, "{} {}", r + 1, cur + 1);
            cur += 1;
        }

        r += 1;
    }

    writeln!(
        buffer,
        "{}",
        is_brown
            .into_iter()
            .map(|b| if b { "b" } else { "g" })
            .collect::<Vec<_>>()
            .join(" ")
    );
}