#include <bits/stdc++.h>
using namespace std;
set<string>sum;
int main(){
	freopen("study.in","r",stdin);
	freopen("study.out","w",stdout);
	int n;
	cin>>n;
	for(int i=0;i<n;i++){
		int a;
		cin>>a;
	    string s;
	    cin>>s;
	    for(int j=0;j<s.size();j++){
	    	if(s[j]>='A'&&s[j]<='Z'){
	    		s[j]+=32;
			}
		}
		if(a==0){
			sum.insert(s);
		}
		if(a==1){
			if(sum.count(s)){
				cout<<"Yes"<<endl;
			}else{
				cout<<"No"<<endl;
			}
		}
	}
	return 0;
}