#include<bits/stdc++.h>

using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int n, v[100001], s[100001], pred[1000001], m;

int main() {
    in>>n;
    for(int i=1;i<=n;i++)
        in>>v[i];

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

    for(int i=1;i<=n;i++)
        if(s[i]>m) {
            m=s[i];
            j=i;
        }
    int k=j;
    n=1;
    out<<m<<'\n';
    for(int i=1;i<m;i++) {
        s[n++]=pred[j];
        j=pred[j];
    }
    for(int i=n-1;i>=1;i--)
        out<<s[i]<<" ";
    out<<k;


}