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#include <cstdio>

int main () {
	int n, f, i;
	int c = 0;
	char ok[4];
	scanf("%d\n", &n);
	for (i = 0; i < n; ++i) {
		scanf("%s %d\n", &ok, &f);
		if (ok[0] == 'N') {
			continue;
		}
		if (c >= 10 && f >= 2) {
			continue;
		}
		printf("%d", i + 1);
		++c;
		if (c == 20) {
			break;
		}
		printf(" ");
	}
	printf("\n");
	return 0;
}