#define taskname ""
#include "molecules.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#ifndef LOCAL
#define cerr \
if (0) \
cerr
#endif
const bool multitest = 0;
int n, l, u;
vector<int> w;
std::vector<int> find_subset(int l, int u, std::vector<int> w)
{
// for (int i = 1; i <= n; i++)
// {
// if (l <= w[i - 1] && w[i - 1] <= u)
// {
// return vector<int>(i);
// }
// }
vector<pair<int, int>> ww;
ll sum = 0;
for (int i = 0; i < n; i++)
{
sum += w[i];
ww.push_back(make_pair(w[i], i));
}
sort(ww.begin(), ww.end());
vector<int> id;
for (int i = n - 1, j = n; i < j && i >= -1;)
{
while (sum > u && i >= 0)
{
sum -= ww[i].first;
i--;
}
if (l <= sum && sum <= u)
{
for (int p = 0; p <= i; p++)
id.push_back(ww[p].second);
for (int p = j; p < n; p++)
id.push_back(ww[p].second);
return id;
}
j--;
sum += ww[j].first;
}
return vector<int>();
}
void solve()
{
cin >> n >> l >> u;
w.assign(n, 0);
for (auto &v : w)
cin >> v;
auto ans = find_subset(l, u, w);
cout << ans.size() << '\n';
for (auto v : ans)
{
cout << v << ' ';
}
}
/*
int32_t main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
if (fopen(taskname ".inp", "r"))
{
freopen(taskname ".inp", "r", stdin);
freopen(taskname ".out", "w", stdout);
}
int tc = 1;
if (multitest)
cin >> tc;
while (tc--)
{
solve();
cout << '\n';
}
}
*/
