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#include<bits/stdc++.h>

using namespace std;


void solve()
{
	int a;
	cin>>a;
	int i=0;
	for(int z=1;z<=a;z++)
	{
		string s;
		cin>>s;
		int k;
		cin>>k;
		if(s[0]=='N')continue;
		if(i>=10)
		{
			if(k<2)
			{
				cout<<z<<" ";
				i++;
			}
			//i++;
			if(i==20)return;
		}else
		{
			cout<<z<<" ";
			i++;
		}
		
	}
}


int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	int h=1;
	while(h--)solve();
	
	return 0;
}