#include <bits/stdc++.h>
using namespace std;
#define MAXH 102
#define MAXW 102
#define MAXN 10005
int h, w, n, a[MAXN], m[MAXH][MAXW];
int main() {
    cin >> h >> w >> n;
    for(int i = 1; i <= n; ++i) {
        cin >> a[i];
    }
    int k = 1;
    for(int i = 0; i < h; ++i) {
        //cout << i << endl;
        if(i%2) {
            //cout<<"impar\n";
            for(int j = w - 1; j >= 0; --j) {
                if(a[k] == 0) {
                    k++;
                }
                m[i][j] = k;
                a[k]--;
            }
        } else {
            for(int j = 0; j < w; ++j) {
                if(a[k] == 0) {
                    k++;
                }
                m[i][j] = k;
                a[k]--;
            }
        }
    }
    for(int i = 0; i < h; ++i) {
        for(int j = 0; j < w; ++j) {
            cout << m[i][j] << ' ';
        }
        cout << "\n";
    }
}