#include <iostream>
using namespace std;
bool R[40005][40005];
pair<unsigned short,unsigned short> P[40005][40005];
unsigned short nr,i,N;
int V[40005];
unsigned short j,k,ok,col,tmp;
int main()
{
    cin>>N;
    for(i=1;i<=N;i++)
    {
        cin>>V[i];
        V[i]%=N;
        R[i][V[i]]=1;
        P[i][V[i]]=make_pair(0,0);
        for(j=1;j<i;j++)
        {
            for(k=0;k<N;k++)
            {
                if(R[j][k]==1)
                    {R[i][(k+V[i])%N]=1;P[i][(k+V[i])%N]=make_pair(j,k);}
            }
            if(R[i][0]==1)
                break;
        }
        if(R[i][0]==1)
            {ok=i;break;}
    }
    col=0;
    while(ok)
    {
        V[++V[0]]=ok;
        tmp=ok;
        ok=P[ok][col].first;
        col=P[tmp][col].second;
    }
    cout<<V[0]<<"\n";
    for(i=1;i<=V[0];i++)
        cout<<V[i]<<" ";
    return 0;
}