#include <iostream>
#define NMax 105
using namespace std;

int mat[NMax][NMax], H, W, colors, count, i, j;
int main() {
    cin >> H >> W;
    cin >> colors;
    i = 1;
    j = 1;
    for (int color = 1; color <= colors; color++) {
        cin >> count;
        while (count) {
            mat[i][j] = color;
            if (i % 2 == 1) {
                i = (j == W) ? (i + 1) : i;
                j = (j < W) ? (j + 1) : W;
            } else {
                i = (j == 1) ? (i + 1) : i;
                j = (j > 1) ? (j - 1) : 1;
            }
            count--;
        }
    }
    for (int i = 1; i <= H ; i++) {
        for (int j = 1; j <= W; j++) {
            cout << mat[i][j] << ' ';
        }
        cout << '\n';
    }
    return 0;
}