#include <iostream>
#include <cmath>
#include <algorithm>

using namespace std;

struct spectacol
{
    float x,y;
    int nr;
}a[101],aux;

int n;
void sortare()
{
    for(int i=1;i<n;i++)
        for(int j=i+1;j<=n;j++)
    {
        if(a[i].y > a[j].y)
            {
            aux.nr =a[i].nr;
            a[i].nr=a[j].nr;
            a[j].nr=aux.nr;
            aux.y = a[i].y;
            a[i].y = a[j].y;
            a[j].y = aux.y;
            aux.x = a[i].x;
            a[i].x=a[j].x;
            a[j].x=aux.x;
            }
    }
}

int main()
{
    int l[1001];
    cin >> n;
    for(int i=1;i<=n;i++)
    {
        cin >> a[i].x >> a[i].y;
        a[i].nr=i;

    }
    sortare();
    int ora=a[1].y;
    l[1]=a[1].nr;
    int c=2;
    for(int i=2;i<=n;i++)
    {
        if(a[i].x >= ora)
            {
                l[c]=a[i].nr;
                c++;
                ora = a[i].y;
            }
    }
    cout << c-1 << endl;
    for(int i=1;i<c;i++)
          cout << l[i] << " ";


    return 0;
}