///////////////////////////////////////////////////////////////////////////////////////////////
#include <bits/stdc++.h>
using namespace std;
#define mp make_pair
#define pb push_back
#define FAST_IO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define FILE_IO(x) freopen((string(x) + ".in").c_str(), "r", stdin); freopen((string(x) + ".out").c_str(), "w", stdout)
#define f first
#define s second
#define x1 x1qwer
#define y1 y1qwer
#define right right123
#define left left123
#define foreach(it, v) for (auto it : v)
#define rep(it, n) for (int it = 0; it < n; ++it)
#define forin(it, l, r) for (int it = l; it < r; ++it)
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const double DINF = numeric_limits<double>::infinity();
const ll MOD = 1e9 + 7;
const double EPS = 1e-7;
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
mt19937 mmtw_(MOD);
uniform_int_distribution<ll> rd_;
ll randomll() { return rd_(mmtw_);}
ll rnd(ll x, ll y) { return rd_(mmtw_) % (y - x + 1) + x; }
////////////////////////////////////////////////////////////////////////////////////////////////
const int MAXN = 1e5 + 5;
int n, d, m;
vector<int> a[MAXN];
int t[MAXN * 10];
bool check(int cnt, bool pr) {
if (pr) cout << cnt << '\n';
queue<int> q;
for (int i = 0; i < n; ++i) {
for (auto it : a[i]) {
q.push(it);
}
for (int j = 0; j < cnt && !q.empty(); ++j) {
int x = q.front();
q.pop();
if (i > t[x] + d) return false;
if (pr) cout << x + 1 << ' ';
}
if (pr) cout << "0\n";
}
if (q.empty()) return true;
return false;
}
int main() {
FAST_IO;
cin >> n >> d >> m;
rep(i, m) {
cin >> t[i];
t[i]--;
a[t[i]].push_back(i);
}
int l = 0, r = m;
while (r - l > 1) {
int m = l + (r - l) / 2;
if (check(m, false)) {
r = m;
} else {
l = m;
}
}
check(r, true);
}
