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#include<bits/stdc++.h>

using namespace std;


int tab[1000009];

int main(){
    ios_base::sync_with_stdio(0);
    int n;cin>>n;
    int jed=0;
    for(int i=0;i<n;++i){
        cin>>tab[i];
        if(tab[i]==1)++jed;
    }
    if(jed>=2){
        cout<<"0\n";
    }
    else if(jed==1){
        cout<<"1\n";
    }
    else cout<<"2\n";

    cout<<"2\n";
    cout<<"1 2\n";



    return 0;
}