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#include<bits/stdc++.h>
using namespace std;

int ones,n,tmp;

int main(){
    ios_base::sync_with_stdio( 0 );
    cin.tie( 0 );
    cin>>n;
    for(int i=0;i<n;i++) {
        cin>>tmp;
        if( tmp == 1 ) ones++;
    }
    if(ones == 0) cout<<"2"<<endl<<"2"<<endl<<"1 2";
    else if(ones == 1) cout<<"1"<<endl<<"2"<<endl<<"1 2";
    else if(ones >= 2) cout<<"0"<<endl<<"2"<<endl<<"1 2";
    return 0;
}