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#include <bits/stdc++.h>


using namespace std;


int main() {
    ios_base::sync_with_stdio(0);

    int n;
    cin >> n;

    int count = 0;
    while (n--) {
        int x;
        cin >> x;

        count += (x == 1);
    }

    cout << max(0, 2 - count) << '\n';
    cout << "2\n1 2";

    return 0;
}