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#include<bits/stdc++.h>
#define ull unsigned long long
#define pb push_back
#define MP make_pair

using namespace std;



int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	int n, cnt = 0;
	cin >> n;
	while(n--){
        int w;
        cin >> w;
        cnt += (w == 1);
	}
	cout << 2 - min(cnt, 2) << endl;
	cout << 2 << endl;
	cout << "1 2";

	return 0;
}