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// PA2025, @mjm, r1c-fin

#include <cstdio>
#include <vector>
using namespace std;
int nextInt() { int n; scanf("%d", &n); return n; }

int main() {
	vector<int> res;
	int n = nextInt();
	for (int i = 1; i <= n && res.size() < 20; ++i) {
		char s[64];
		scanf("%s", s);
		int cnt = nextInt();
		if ((*s) == 'N') continue;
		if (cnt >= 2 && res.size() >= 10) continue;
		res.push_back(i);
	}

	printf("%d", res[0]);
	for (int i = 1; i < res.size(); ++i)
		printf(" %d", res[i]);
	printf("\n");

	return 0;
}