/* Author : Mychecksdead */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
#define ff first
#define ss second
#define pii pair<int,int>
#define vi vector<int>
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;
int sz, T[N];
void build(){
for(int i = 0; i <= 2*sz + 1; ++i) T[i] = 0;
}
void upd(int v, int val){
v += sz;
T[v] = max(T[v], val);
for(v >>= 1; v > 0; v >>= 1) T[v] = max(T[v<<1], T[v<<1|1]);
}
int get(int l, int r){
l += sz;
r += sz + 1;
int res = 0;
for(; l < r; l >>= 1, r >>= 1){
if(l&1) res = max(res, T[l++]);
if(r&1) res = max(res, T[--r]);
}
return res;
}
int n, k;
array<int, 3> a[N];
void solve(){
cin >> n >> k;
vi val;
for(int i = 1; i <= n; ++i){
cin >> a[i][0] >> a[i][1];
a[i][2] = i;
val.pb(a[i][0]);
val.pb(a[i][1]);
}
val.pb(0);
sort(all(val));
val.erase(unique(all(val)), val.end());
int m = val.size();
--m;
sort(a+1, a+1+n);
sz = m;
build();
vector<array<int, 2>> dp(m + 1);
for(int i = 1; i <= n; ++i){
int L = lower_bound(all(val), a[i][0]) - val.begin();
int R = lower_bound(all(val), a[i][1]) - val.begin();
dp[R][0] = max(dp[R][0], get(1, L) + 1);
upd(R, dp[R][0]);
}
for(int i = 1; i <= m; ++i) dp[i][0] = max(dp[i][0], dp[i - 1][0]);
sort(a+1, a+1+n, [&](const array<int, 3> &x, const array<int, 3> &y){
return x[1] < y[1];
});
build();
for(int i = n; i >= 1; --i){
int L = lower_bound(all(val), a[i][0]) - val.begin();
int R = lower_bound(all(val), a[i][1]) - val.begin();
dp[L][1] = max(dp[L][1], get(R, m) + 1);
upd(L, dp[L][1]);
}
for(int i = m - 1; i >= 1; --i) dp[i][1] = max(dp[i][1], dp[i + 1][1]);
vi pos(n + 1);
for(int i = 1; i <= n; ++i){
pos[a[i][2]] = i;
}
vi res;
set<array<int, 4>> S;
for(int i = 1; i <= n; ++i){
if(S.size() == k) break;
int L = lower_bound(all(val), a[pos[i]][0]) - val.begin();
int R = lower_bound(all(val), a[pos[i]][1]) - val.begin();
int ldp = dp[R][0];
int rdp = dp[L][1];
if(ldp + rdp >= k + 1){
auto it = S.upper_bound(array<int, 4>{R, -1, -1, -1});
if(it != S.begin() && (*prev(it))[1] > L){
continue;
}
int total_dp = 0, r_pos = m, l_pos = 1;
if(it != S.end()) total_dp += (*it)[3], r_pos = (*it)[0];
if(it != S.begin()) total_dp += (*prev(it))[2], l_pos = (*prev(it))[1];
total_dp++;
total_dp += dp[L][0] - dp[l_pos][0];
total_dp += dp[R][1] - dp[r_pos][1];
assert(R <= r_pos);
assert(l_pos <= L);
if(total_dp >= k){
S.insert({L, R, ldp, rdp});
res.pb(i);
}
}
}
if(res.size() < k){
cout << -1;
return;
}
sort(all(res));
for(int x: res) cout << x << '\n';
}
int main(){
cin.tie(0); ios::sync_with_stdio(0);
int tt = 1, aa;
// freopen("in.txt", "r", stdin);
// freopen("out.txt", "w", stdout);
while(tt--){
solve();
}
cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
return 0;
}
