// A lehető legkevesebb átszállá.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <algorithm>
using namespace std;
int jok[1000001]{ 0 };
int tombkezd[1000001]{ 0 };
int tombveg[1000001]{ 0 };

int main()
{
    int n, m, kezd, veg, hol = 1,  jo, valami=0,max=0,z=1,db=0,t=1,ln=0;
    cin >> n >> m;
    for (int i = 1; i <= n; i++) 
    {
        cin >> kezd >> veg;
        tombkezd[i] = kezd;
        tombveg[i] = veg;
        if (veg > ln) {
            ln = veg;
        }
    }
    if (ln < m) {
        cout << "-1";
    }
    while (hol < m) 
    {   
        valami = 0;
        for (int i = 1; i <= n; i++) {
            if (tombkezd[i] == hol and tombveg[i]>max) {
                valami = 1;
                max = tombveg[i];
                jo = i;
            }
        }
        hol = max;
        if (valami == 0) {
            hol=max-z;
            z++;
        }
        if (valami == 1) {
            jok[t] = jo;
            t++;
            z = 1;
        }
        if (hol <= 0) {
            cout << "-1";
            break;
        }
    }
    if (hol > 0) {
        cout << t - 2 << endl;
        for (int alma = 1; alma <= t - 1; alma++) {
            cout << jok[alma] << " ";
        }
    }
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

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//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file