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#include <bits/stdc++.h>

using namespace std;

typedef long long LL;
typedef pair<int, int> PII;
const int N = 1e6;


int main()
{
    int n,t = 0, a;
    scanf("%d", &n);

    for(int i = 0;i < n;++i)
    {
        scanf("%d", &a);
        if(a ==  1)
        {
            ++t;
        }
    }

    if(t >= 2)
        printf("0\n2\n1 2\n");
    else if(t == 1)
    {
        printf("1\n2\n1 2\n");
    }
    else
    {
        printf("2\n2\n1 2\n");
    }
    return 0;
}