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#include <bits/stdc++.h>

#define DEBUG if (1)
#define COUT cout << "\e[36m"
#define VAR(v) " [\e[32m" << #v << "\e[36m=\e[91m" << v << "\e[36m] "
#define ENDL "\e[39m" << endl

using namespace std;

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

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

    return 0;
}