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#include <bits/stdc++.h>
using namespace std;
int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;

    int l_jed = 0;
    int x;
    for(int i = 0; i < n; i++){
        cin >> x;
        if(x==1)
            l_jed++;
    }
    cout << max(0, 2-l_jed) << "\n";
    cout << "2\n1 2\n";
    return 0;
}