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#include <iostream>
#include <vector>
#include <algorithm>
#include <cstring>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    int ile_jedynek = 0;
    for( int i = 0; i < n; i ++ )
    {
        int d;
        cin >> d;
        if( d == 1 ) ile_jedynek ++;
    }
    if( ile_jedynek >= 2 )
    {
        cout << 0 << "\n";
        cout << 2 << "\n";
        cout << 1 << " " << 2;
    }
    if( ile_jedynek == 1 )
    {
        cout << 1 << "\n";
        cout << 2 << "\n";
        cout << 1 << " " << 2;
    }
    if( ile_jedynek == 0 )
    {
        cout << 2 << "\n";
        cout << 2 << "\n";
        cout << 1 << " " << 2;
    }
    return 0;
}