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#include <bits/stdc++.h>

#define forn(i, n) for(int i = 0; i < n; ++i)

using namespace std;

typedef long long LL;
typedef pair<int, int> pint;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    int n, ones = 0;
    cin >> n;
    for (int i=0; i<n; i++)
    {
        int x;
        cin >> x;
        ones += (x == 1);
    }
    cout << max(0, 2-ones) << "\n";
    cout << "2\n1 2";
    
    return 0;
}