#include <bits/stdc++.h>
using namespace std;

int main() {
    int N; cin >> N;
    int * type = new int[N];
    for (int i = 0; i < N; i++)
    {
        char c; cin >> c;
        if (c == 'V') {
            int v; cin >> v;
            type[i] = v - 1;
        }
        else {
            type[i] = -1;
        }
    }
    bool * active = new bool[N];
    fill(active, active + N, true);
    vector<int> r;
    for (int i = N - 1; i >= 0; i--)
    {
        if (active[i]) {
            r.push_back(i);
            if (type[i] != -1) {
                active[type[i]] = false;
            }
        }
    }
    cout << r.size() << '\n';
    for (int i = r.size() - 1; i >= 0; i--)
    {
        cout << r[i] + 1 << ' ';
    }
    cout << endl;
}