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#include<bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> ans;
    for(int i = 0; i < n; i++){
        string s;
        int x;
        cin >> s >> x;
        if(s[0] == 'N')continue;
        if(x > 1 and ans.size() >= 10)continue;
        if(ans.size() == 20)continue;
        ans.push_back(i+1);
    }
    for(auto u: ans){
        cout << u << " ";
    }
    cout << "\n";
    
    return 0;
}