#include <bits/stdc++.h>
using namespace std;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;

	int p = 2;
	while (p < n) {
		if (n % p == 0)
			break;
		p++;
	}

	if (p >= n) {
		cout << "-1\n";
		return 0;
	}

	if (n % 2 == 0) {
		cout << n / 2 << '\n';
		for (int i = 1; i <= n / 2; i++) {
			cout << 2 << ' ' << 2 * i - 1 << ' ' << 2 * (n - i + 1) - 1 << '\n';
		}
		return 0;
	}

	vector<vector<int>> groups(p);

	for (int j = 0; j < p; j++) {
		for (int k = 0; k < p; k++) {
			groups[(j + k) % p].push_back(2 * (1 + j * p + k) - 1);
		}
	}

	int cur = 0;
	for (int l = 1 + p * p, r = n; l < r; l++, r--) {
		groups[cur].push_back(2 * l - 1);
		groups[cur].push_back(2 * r - 1);
		cur = (cur + 1) % p;
	}

	cout << groups.size() << '\n';
	for (auto g : groups) {
		cout << g.size() << ' ';
		for (int x : g)
			cout << x << ' ';
		cout << '\n';
	}

	return 0;
}