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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    int zmiany = 2;
    for(int i = 0; i < n; i++){
        int pom;
        cin >> pom;
        if(pom == 1){
            zmiany = max(0, zmiany - 1);
        }
    }
    cout << zmiany << "\n2\n1 2\n";
}