import std.stdio, std.conv, std.string;
import std.algorithm, std.array, std.container, std.typecons;
import std.numeric, std.math;
import core.bitop;

T RD(T = string)() { static string[] ss; while(!ss.length) ss = readln.chomp.split; string res = ss[0]; ss.popFront; return res.to!T; }
string RDR()() { return readln.chomp; }
T[] ARR(T)(in string str, T fix = 0) { auto r = str.split.to!(T[]); r[] += fix; return r; }
size_t[] MAKE_IDX(alias less = "a < b", Range)(Range range) { auto idx = new size_t[](range.length); makeIndex!(less)(range, idx); return idx;}
size_t MIN_POS(alias less = "a < b", Range)(Range range) { auto r = minPos!(less)(range); return range.length - r.length; }

bool INSIDE(T)(T x, T b, T e) { return x >= b && x < e; }

long mod = pow(10, 9) + 7;
void moda(ref long x, long y) { x = (x + y) % mod; }
void mods(ref long x, long y) { x = ((x + mod) - (y % mod)) % mod; }
void modm(ref long x, long y) { x = (x * y) % mod; }

struct UnionFind
{
	void init(long n) { par = new long[](n); foreach (i; 0..n) par[i] = i; }
	long root(long i) { return par[i] == i ? i : (par[i] = root(par[i])); }
	bool same(long i, long j) { return root(i) == root(j); }
	void unite(long i, long j) { i = root(i); j = root(j); if (i == j) return; par[i] = j; }
	long[] par;
}

long[] dijkstra(long from, long to, long[][] edges)
{
	long[] path;
	auto cost = new long[](edges.length); fill(cost, long.max); cost[from] = 0;
	long[][] open = [[from]];
	while (!open.empty)
	{
		auto n = open.front; open.popFront;
		auto p = n[0];
		foreach (i; 0..edges.length)
		{
			if (edges[p][i] == -1) continue;
			auto c = cost[p] + edges[p][i];
			if (c < cost[to] && c < cost[i]) { cost[i] = c; if (i == to) path = i ~ n; else open ~= i ~ n; }
		}
	}
	return cost[to] ~ path;
}

void main()
{
	auto H = RD!long;
	auto W = RD!long;
	auto N = RD!long;
	auto a = RDR.ARR!long;

	auto ans = new long[][](H, W);
	long pos;
	foreach (i; 0..H)
	{
		foreach (j; 0..W)
		{
			auto x = i % 2 == 1 ? W - j - 1 : j;
			ans[i][x] = pos + 1;
			--a[pos];
			if (a[pos] == 0) ++pos;
		}
	}

	foreach (i; 0..H)
	{
		write(ans[i][0]);
		foreach (j; 1..W)
		{
			write(" ", ans[i][j]);
		}
		writeln();
	}
	stdout.flush();
}