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#include <iostream>
#include <cstdlib>

using namespace std;

int main() {
    int n, di, ile=0;
    cin >> n;
    for(int i=0;i<n;i++){
        cin >> di;
        if(di==1)
            ile++;
    }
    if(ile>2)
        ile=2;
    cout<< (2-ile) << endl
            << "2" << endl
            << "1 2" << endl;
    return 0;
}