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#include <bits/stdc++.h>
using namespace std;
int t[1000005], x1, x2, n;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n;
    for (int i = 1; i <= n; i++)
    {
        cin>>t[i];
        if (t[i]==1 && x1==0)
            x1=i;
        else if (t[i]==1 && x2==0)
            x2=i;
    }
    if (x1 && x2)
    {
        cout<<0<<endl;
        cout<<2<<endl;
        cout<<1<<" "<<2<<endl;
    }
    else if (x1)
    {
        cout<<1<<endl;
        cout<<2<<endl;
        cout<<1<<" "<<2<<endl;
    }
    else
    {
        cout<<2<<endl;
        cout<<2<<endl;
        cout<<1<<" "<<2<<endl;
    }
}