#include<bits/stdc++.h>
using namespace std;
#define int long long
#define in array<int, 2>
#define pb push_back
#define pob pop_back
#define fast() ios_base::sync_with_stdio(false); cin.tie(NULL)
const int MX = 2e5+5;
const int INF = 1e17;
signed main()
{
fast();
int n, k; cin >> n >> k;
vector<vector<int>> op;
int A;
for(int i = 1; i <= n; i++)
cin >> A;
if((n*A)%k != 0)
{
cout << "-1\n";
return 0;
}
int g = __gcd(n, k);
int kp = k/g;
int m = A/kp;
//we want final values as m*kp
for(int i = 1; i <= (n/g); i++)
{
//1 + g*i to k + g*i
cout << m << " ";
for(int t = 1; t <= k; t++)
cout << ((t+g*i)%n + 1) << " ";
cout << "\n";
}
return 0;
}
