package main

import . "fmt"

const X=5e17

func abs(a int64) int64 {
	if a<0 {
		return -a
	}
	return a
}

func max(a,b int64) int64 {
	if a<b {
		return b
	}
	return a
}

func main() {
	var n int
	Scan(&n)
	a:=make([]int64,n,n)
	b:=make([]int64,n,n)
	for i:=range a {
		Scan(&a[i],&b[i])
	}
	u:=[]int{}
	v:=[]int{}
	for i:=0;i<50;i++ {
		best:=int64(X)*2
		t:=-1
		for k:=1;k<n;k++ {
			aa:=(a[0]+a[k])/2
			bb:=(b[0]+b[k])/2
			s:=max(abs(aa-X),abs(bb-X))
			if s<best {
				best=s
				t=k
			}
		}
		if t>0 {
			u=append(u,1)
			v=append(v,t+1)
			aa:=(a[0]+a[t])/2
			bb:=(b[0]+b[t])/2
			a[0],b[0]=aa,bb
			a[t],b[t]=aa,bb
		}
	}
	Println(len(u))
	for i,e:=range u {
		Println(e,v[i])
	}
}