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#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    
    int je = 0;
    while (n-->0) {
        int x;
        cin >> x;
        if (x == 1)
            ++je;
        if (je >= 2)
            break;
    }
    
    cout << (2 - je) << endl;
    cout << 2 << endl;
    cout << 1 << ' ' << 2 << endl;
}