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#include <iostream>
using namespace std;
int getint(){
    char c;int temp=0;
    do{
        c=getchar_unlocked();
    }while(c<'0' || c>'9');
    do{
        temp=temp*10+c-'0';
        c=getchar_unlocked();
    }while(c>='0' && c<='9');
    return temp;
}
int ile;int k,tab[1000000];
int x=0;
int main(){
    ile=getint();
    for(int i=0;i<ile;i++){
        tab[i]=getint();
        if(tab[i]==1)x++;
    }
    if(x==0){
         cout<<2<<endl<<2<<endl<<"1 2";
    }
    else if(x==1){
        cout<<1<<endl<<2<<endl<<"1 2";
    }
    else{
        cout<<0<<endl;
        cout<<2<<endl<<"1 2";
    }
    return 0;
}