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#include <stdio.h>
#include <vector>
using namespace std;

int main() {
  int n; 
	char s[13];
  scanf("%d" ,&n);
	vector<int> ret;
	for (int i = 1; i <= n; i++) {
		int x;
		scanf("%s %d", s, &x);
		if (s[0] == 'N') continue;
		if (ret.size() < 10) {
			ret.push_back(i);
			continue;
		}
		if (x < 2) ret.push_back(i);
	}
	int u = 20;
	if (ret.size() < u) u = ret.size();
	for (int i = 0; i < u; i++) printf("%d ", ret[i]);
	printf("\n");
	return 0;
}