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#include <cstdio>
#include <algorithm>

using namespace std;

typedef pair<int, int> pii;

const int INF = 1e7;

int main()
{
    int n;
    scanf("%d", &n);
    int a = INF;
    int b = INF;
    for(int i = 1; i <= n; i++)
    {
        int d;
        scanf("%d", &d);
        if(d < a)
        {
            b = a;
            a = d;
        }
        else if(d < b)
            b = d;
    }
    int w  = 0;
    if(a > 1) w++;
    if(b > 1) w++; 
    printf("%d\n2\n1 2", w);
}