#include <bits/stdc++.h>
// #pragma GCC target("popcnt")
#define fr(i, a, b) for(int i = a; i <= b; i++)
#define rf(i, a, b) for(int i = a; i >= b; i--)
#define fe(x, y) for (auto& x : y)
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define pw(x) (1LL << (x))
#define sz(x) (int)x.size()
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define fbo find_by_order
#define ook order_of_key
template <typename T>
using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <typename T>
using ve = vector <T>;
template <typename T>
bool umx (T& a, T b) { return a < b ? a = b, 1 : 0; }
template <typename T>
bool umn (T& a, T b) { return a > b ? a = b, 1 : 0; }
using ll = long long;
using ld = long double;
using pll = pair <ll, ll>;
using pii = pair <int, int>;
using ull = unsigned long long;
const int oo = 1e9 + 100;
const ll OO = 1e18;
const int N = 5e5 + 10;
const int M = 3e3 + 10;
const int mod = 998244353;
const bool TEST = 0;
mt19937_64 rng(228);
void precalc() {}
ll mn[N][20];
ll go[N];
int get(int l, int r) {
int S = 0;
for (int i = 19; i >= 0; i--) if (mn[l][i] <= r) {
S += pw(i);
l = mn[l][i];
}
return S;
}
void slv() {
int n, k;
cin >> n >> k;
ve <array <ll, 3>> ev(n);
ve <array <ll, 3>> V;
for (int i = 0; i < n; i++) {
cin >> ev[i][0] >> ev[i][1];
V.pb({ev[i][0], i, 0});
V.pb({ev[i][1], i, 1});
}
int c = 0;
{
sort(all(V));
ev[V[0][1]][V[0][2]] = c;
for (int i = 1; i < sz(V); i++) {
c += bool(V[i][0] != V[i - 1][0]);
ev[V[i][1]][V[i][2]] = c;
}
}
fill(go, go + 2 * n + 2, 2 * n);
for (int i = 0; i < n; i++) {
umn(go[ev[i][0]], ev[i][1]);
}
for (int i = 2 * n - 1; i >= 0; i--) umn(go[i], go[i + 1]);
for (int i = 0; i < 20; i++) mn[2 * n][i] = 2 * n;
for (int i = 2*n - 1; i >= 0; i--) {
mn[i][0] = go[i];
for (int st = 1; st < 20; st++) mn[i][st] = mn[mn[i][st - 1]][st - 1];
}
set <pii> Seg;
int S = get(0, 2 * n - 1);
if (S < k) {
cout << "-1\n";
exit(0);
}
ve <int> ans;
for (int i = 0; i < n; i++) {
int l = ev[i][0];
int r = ev[i][1];
int lt = 0, rt = 2 * n - 1;
bool ok = 1;
{
auto it = Seg.lower_bound({l, -oo});
if (it != Seg.end()) {
ok &= ((*it).fi >= r);
rt = (*it).fi;
}
if (it != Seg.begin()) {
--it;
lt = (*it).se;
ok &= ((*it).se <= l);
}
}
if(!ok) continue;
int was = get(lt, rt);
int have = S - was + get(lt, l) + get(r, rt) + 1;
if (have >= k) {
S = have;
Seg.insert({l, r});
ans.pb(i);
}
if (sz(ans) == k) break;
}
fe(x, ans) {
cout << x + 1 << '\n';
}
}
int main() {
#ifdef LOCAL
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#else
ios_base::sync_with_stdio(0);
cin.tie(0);
#endif
precalc();
cout << fixed << setprecision(13);
int q = 1;
if (TEST) cin >> q;
while (q--) slv();
return 0;
}
