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#include <iostream>
#include <vector>

using namespace std;
int n,a, d;
int main()
{
    ios_base::sync_with_stdio(false);
    cin>>n;

    for(int i = 1; i<=n; i++){
        cin>>a;
        if(a==1) d++;
    }
    if(d>1)
    {
        cout<<0<<"\n";
        cout<<2<<"\n";
        cout<<1<<" "<<2<<"\n";
    }
    else if(d==1)
    {
        cout<<1<<"\n";
        cout<<2<<"\n";
        cout<<1<<" "<<2<<"\n";
    }
    else if(d==0)
    {
        cout<<2<<"\n";
        cout<<2<<"\n";
        cout<<1<<" "<<2<<"\n";
    }
        /*(for(int i = 0; i<pop.size(); i++){
            cout<<pop[i]<<" ";

        }*/
    return 0;
}