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#include <cstdio>
#include <iostream>

using namespace std;

int main() {
    int n;
    int count = 1;

    scanf("%d", &n);

    for(int i = 1; i <= n; i++) {
        string can;
        int how_many;
        cin >> can;
        scanf("%d", &how_many);
        if(can == "NIE") {
            continue;
        }

        if(count <= 10) {
            count++;
            printf("%d ", i);
        } else if (count <= 20 && how_many < 2) {
            count++;
            printf("%d ", i);
        } 
    }

    printf("\n");

    return 0;
}