#include<cstdio>
using namespace std;

int x,y,n,k,i,p;


int a[400009], frec[400009],st,dr;

int main()
{
    freopen("a.in","r",stdin);
    // freopen("a.out","w",stdout);

    scanf("%d",&n);
    long long int sol = 0;

    for(i = 1; i <= n ;i++)
    {
        scanf("%d",&a[i]);
        sol = (sol + a[i]) % n;
        //printf("%d\n",sol);
        if(sol == 0)
        {

            st = 1;
            dr = i;
            break;
        }
        if(frec[sol] != 0)
        {
            st = frec[sol] + 1;
            dr = i;
            break;
        }
        frec[sol] = i;
    }
    printf("%d\n",dr - st + 1);
    for(i = st; i <= dr ;i++)
    {
        printf("%d ", i);
    }

}