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#include <bits/stdc++.h>

using namespace std;

int main(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    int n;
    cin >> n;
    int ile_jedynek = 0;
    for(int i = 0; i < n; i++){
        int x;
        cin >> x;
        if(x == 1){
            ile_jedynek++;
        }
    }
    
    if(ile_jedynek > 1){
        cout << "0\n2\n1 2\n";
    } else if(ile_jedynek == 1){
        cout << "1\n2\n1 2\n";
    } else {
        cout << "2\n2\n1 2\n";
    }
}