package main

import . "fmt"

func main() {
	var x int64
	Scan(&x)
	if x == 1 {
		Println(2)
		Println(1, 2)
		Println("b g")
		return
	}
	ps := []int64{}
	var cnt int64
	for x % 2 == 0 {
		if len(ps)>0&&ps[len(ps)-1] == 2 {
			ps[len(ps)-1]+=2
			cnt += 2
		} else {
			ps = append(ps, 2)
			cnt += 3
		}
		x /= 2
	}
	for i := int64(3); i<=x&&i<2e5 ; i+= 2 {
		if x % i != 0 {
			continue
		}
		for x % i == 0 {
			ps = append(ps, i)
			x /= i
			cnt += i+1
		}
		if cnt > 2e5 {
			Println(-1)
			return
		}
	}
	if x > 1 {
		if cnt + x+1 > 2e5 {
			Println(-1)
			return
		}
		ps = append(ps, x)
		cnt += x+1
	}
	Println(cnt)
	bg := make([]any, 0, cnt)
	var prev, id int64
	for _, p := range ps {
		id++
		if prev > 0 {
			Println(prev, id)
		}
		bg = append(bg, "b")
		for i := int64(1); i <= p; i++ {
			Println(id, id+i)
			bg = append(bg, "g")
		}
		prev, id = id, id+p
	}
	Println(bg...)
}