#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <iomanip>
#include <utility>
#include <tuple>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <deque>
#include <unordered_map>
#include <unordered_set>
#include <bitset>
#include <cctype>
#include <cassert>
#include <functional>
#include <numeric>
#include <type_traits>
using namespace std;
#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define coutf(f) cout << fixed << setprecision(f)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()

int main() {
	ll n, s;
	cin >> n >> s;
	vector<int> ans;
	for (ll i = n; i >= 1; i--) {
		if (s >= i) {
			ans.push_back(i);
			s -= i;
		}
	}
	reverse(all(ans));
	cout << ans.size() << endl;
	rep(i, ans.size()) cout << ans[i] << endl;
	return 0;
}