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#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n, j = 0;
    cin >> n;
    vector<int> v(n);

    for(int i = 0; i < n; ++i) {
        cin >> v[i];
        if(v[i] == 1) ++j;
    }

    if(j) {
        if(j == 1) cout << 1 << '\n' << 2 << '\n' << 1 << ' ' << 2;
        else cout << 0 << '\n' << 2 << '\n' << 1 << ' ' << 2;
    }
    else cout << 2 << '\n' << 2 << '\n' << 1 << ' ' << 2;

    return 0;
}