//    01001100 01001111 01010100 01000001    \\
            //                                           \\
            //                ╦  ╔═╗╔╦╗╔═╗               \\
            //                ║  ║ ║ ║ ╠═╣               \\
            //                ╩═╝╚═╝ ╩ ╩ ╩               \\
            //                                           \\
            //    01001100 01001111 01010100 01000001    \\
#include <bits/stdc++.h>
using namespace std;
#define N 1000002
#define nl '\n'
#define ff first
#define ss second
#define ll long long
#define ld long double
#define terminator main
#define pll pair<ll,ll>
#define append push_back
#define pii pair<int,int>
#define all(x) (x).begin(),(x).end()
#define L0TA ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
int s[N];
int a[N];
int r[N];
vector<int> x[N];
void solve(){
    int n, k, p;
    cin >> n >> k;
    a[n + 1] = 30;
    priority_queue<pii, vector<pii>, greater<pii>> Q;
    for(int i = 1; i <= n; i++){
        cin >> s[i];
        a[i] = s[i];
        r[i] = i + 1;
        Q.push({a[i], i});
    }
    while(Q.top().ff != 30){
        p = Q.top().ss;
        Q.pop();
        if(a[p] == a[r[p]]){
            Q.pop();
            r[p] = r[r[p]];
        }
        else{
            k--;
            x[r[p] - 1].append(a[p]);
        }
        a[p]++;
        Q.push({a[p], p});
    }
    for(int i = 1; i <= n; i++){
        cout << s[i] << ' ';
        for(auto & j : x[i])
            cout << j << ' ';
    }
}
int terminator(){
    L0TA;
    solve();
    return 0;
}
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