#include <bits/stdc++.h>
using namespace std;
vector<pair<char,int>> tv={{'0',0}};
vector<int> t;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin>>n;
    t.resize(n+1,0);
    for (int i=1; i<=n;i++){
        char a;
        cin>>a;
        if (a=='V'){
            int x;
            cin>>x;
            tv.push_back({a,x});
        }
        else tv.push_back({a,0});
    }
    int ans=0;
    vector<int> v;
    for (int i=n;i>0;i--){

        if (t[i]==0){
            ans++;
            v.push_back(i);
            if (tv[i].first=='V'){
                if (t[tv[i].second]==0) t[tv[i].second]=1;
            }
        }

    }
    cout<<ans<<endl;
    reverse(v.begin(), v.end());
    for (int x: v) cout<<x<<" ";
}