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#include <bits/stdc++.h>
using namespace std;
int n, x, cnt;
int main()
{   ios_base::sync_with_stdio(0);
    cin >> n;
    for(int i = 1; i <= n; i++)
    {   cin >> x;
        if(x == 1)
            cnt++;
    }
    if(cnt > 2)
        cout << "0\n2\n1 2\n";
    else if(cnt == 1)
        cout << "1\n2\n1 2\n";
    else cout << "2\n2\n1 2\n";
}