import java.io.*;
import java.util.*;
public class jobs {
public static class Request {
public int requestNumber;
public int recievedDay;
public int processedDay;
public Request(int requestNumber, int recievedDay) {
this.requestNumber = requestNumber;
this.recievedDay = recievedDay;
}
}
public static class daySchedule {
public int dayNumber;
public int requestCount;
public daySchedule(int dayNumber, int requestCount) {
this.dayNumber = dayNumber;
this.requestCount = requestCount;
}
}
public static void main(String[] args) {
Kattio io = new Kattio();
int n, d, m;
n = io.nextInt();
d = io.nextInt();
m = io.nextInt();
Request[] requests = new Request[m];
for (int x, i = 0; i < m; i++) {
x = io.nextInt();
requests[i] = new Request(i + 1, x + 0);
}
Arrays.sort(requests, (r, l) -> r.recievedDay - l.recievedDay);
PriorityQueue<daySchedule> pq = new PriorityQueue<>((r, l) -> {
if (r.requestCount != l.requestCount)
return r.requestCount - l.requestCount;
return r.dayNumber - l.dayNumber;
});
for (int i = 1; i <= d; i++)
pq.add(new daySchedule(i, 0));
int pos = 0;
for(int day = 1; day <= n && pos < m; day++) {
pq.add(new daySchedule(day + d, 0));
if (day < requests[pos].recievedDay)
continue;
while(pos < m && requests[pos].recievedDay == day) {
daySchedule schedule = pq.poll();
if (schedule.dayNumber < day)
continue;
schedule.requestCount++;
requests[pos++].processedDay = schedule.dayNumber;
pq.add(schedule);
}
}
Arrays.sort(requests, (r, l) -> r.processedDay - l.processedDay);
int minimumMachines = Integer.MIN_VALUE;
for(int ipos, i = 0; i < m; ) {
ipos = i;
while(i < m && requests[i].processedDay == requests[ipos].processedDay)
i++;
if (i - ipos > minimumMachines)
minimumMachines = i - ipos;
}
io.println(minimumMachines);
pos = 0;
for(int day = 1; day <= n; day++) {
while(pos < m && requests[pos].processedDay == day) {
io.print(requests[pos++].requestNumber + " ");
}
io.println(0);
}
io.close();
}
static class Kattio extends PrintWriter {
private BufferedReader r;
private StringTokenizer st;
// standard input
public Kattio() { this(System.in, System.out); }
public Kattio(InputStream i, OutputStream o) {
super(o);
r = new BufferedReader(new InputStreamReader(i));
}
// USACO-style file input
public Kattio(String problemName) throws IOException {
super(problemName + ".out");
r = new BufferedReader(new FileReader(problemName + ".in"));
}
// returns null if no more input
public String next() {
try {
while (st == null || !st.hasMoreTokens())
st = new StringTokenizer(r.readLine());
return st.nextToken();
} catch (Exception e) { }
return null;
}
public int nextInt() { return Integer.parseInt(next()); }
public double nextDouble() { return Double.parseDouble(next()); }
public long nextLong() { return Long.parseLong(next()); }
}
}
