PAT 1124

#include<cstdio>
#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<map>
using namespace std;

const int maxn=1010;
map<string,bool> flag;
int main()
{
	string a[maxn];
	int m,n,s;
	cin>>m>>n>>s;
	for(int i=1;i<=m;i++)
	{
		cin>>a[i];
		flag[a[i]]=false;
	}
	if(s>m)
		cout<<"Keep going...";
	for(int i=s;i<=m;i+=n)
	{
		if(flag[a[i]]==false)
		{
			flag[a[i]]=true;
			cout<<a[i]<<endl;
		}
		else
			i=i-n+1;
	}
	system("pause");
	return 0;
}