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#include <bits/stdc++.h>

using namespace std;

#define ll long long

int n,x,ile=0;

void read(){
    cin >> n;
    for(int i=0; i<n; i++){
        cin >> x;
        if(x==1)
            ile++;
    }
}

void solve(){
    if(ile>=2)
        cout << "0\n2\n1 2";
    if(ile==1)
        cout << "1\n2\n1 2";
    if(ile==0)
        cout << "2\n2\n1 2";
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie();
    cout.tie();

    read();
    solve();

    return 0;
}