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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,ile=0,a,pom;
    cin>>n;
    for(int i=0;i<n;++i)
    {
        cin>>a;
        if(a==1) ile++;
    }
    if(ile>=2)pom=0;
    else if(ile==1)pom=1;
    else if(ile==0)pom=2;
    cout<<pom<<"\n";
    cout<<2<<"\n";
    cout<<1<<" "<<2;
    return 0;
}