#include<bits/stdc++.h>
// #define int ll
#define forn(i,n) for(int i=0;i<(n);i++)
#define Forn(i,n) for(int i=1;i<=(n);i++)
#define ll long long
#define pb push_back
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define rz resize
#define vi vector<int>
#define vl vector<long long>
#define vpi vector<pair<int,int> >
#define pii pair<int,int>
#define pll pair<long long,long long>
#define mp make_pair
#define all(p) p.begin(),p.end()
#define alr(p,q) p+1,p+q+1
#define ull unsigned long long
#define st0(p) memset((p),0,sizeof(p))
#define T(x) ((x)%2 ? s[(x)/2] : '.')
#define lowb(x) x&-x
#define ls(x) (x)*2
#define rs(x) (x)*2+1
using namespace std;
inline void USACO(const string &s){
freopen((s+".in").c_str(),"r",stdin);
freopen((s+".out").c_str(),"w",stdout);
}
void debug() {cout << endl;}
template <class T, class ...U> void debug(T a, U ... b) { cout << a << " "; debug(b...);}
// template <class T> int max(T a, T ... b) { cout << a << " "; debug(b...);}
#define fail() {cout << "-1\n";return;}
const int INF = 1e9+7;
const int N = 1e6+9;
int n,d,m;
vpi a;
bool check(int x){
int cur = 1,res = x;
for(auto &i : a){
if(cur >= i.F + d) return 0;
if(cur < i.F ) cur++,res = x;
res--;
if(res == 0) cur++,res = x;
}
return 1;
}
void out(int x){
int cur = 1,res = x;
for(auto &i : a){
if(cur < i.F || res == 0){
cout << "0\n";
cur++,res = x;
}
cout << i.S << ' ';
res--;
}
while(cur <= n) cur++,cout << "0\n";
}
void solve(){
cin >> n >> d >> m;
a.rz(m);
forn(i,m) cin >> a[i].F,a[i].S = i+1;
sort(all(a));
int lo =0,hi = n;
while(lo != hi-1){
int mid = (lo+hi)/2;
if(check(mid)) hi = mid;
else lo = mid;
}
cout << hi << '\n';
out(hi);
}
signed main(){
// USACO("sabotage");
cin.tie(0);
cout.tie(0);
ios_base::sync_with_stdio(0);
// int t;
// cin >> t;
// while(t--)
solve();
return 0;
}
