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#include<bits/stdc++.h>
using namespace std;
int num, ones = 0, temp;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> num;
    for (int i = 0; i < num; ++i)
    {
        cin >> temp;
        if (temp == 1)
            ones++;
    }
    if (ones == 0)
        cout << 2 << '\n';
    else if (ones == 1)
        cout << 1 << '\n';
    else cout << 0 << '\n';
    cout << 2 << '\n' << 1 << ' ' << 2;
    return 0;
}