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#include<bits/stdc++.h>

using namespace std;

int n, a, ile;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    for(int i = 1; i<=n; i++)
    {
        cin >> a;
        if(a == 1 && ile <2)
        {
            ile++;
        }
    }
    if(ile == 2)
        cout << "0\n2\n1 2";
    if(ile == 0)
        cout << "2\n2\n1 2";
    if(ile == 1)
        cout << "1\n2\n1 2";
}