#include<bits/stdc++.h>
using namespace std;
bool found[10010];
int main()
{
	int n,p;
	int i,j=0,k=-1;
	char s1[10010],s2[10010],re[10010];
	scanf("%d%s%d",&n,s1,&p);p--;
	for(i=0;i<n;i++) s2[i]=s1[i];
	sort(s2,s2+n);
	while(j<n)
	{
		for(i=0;i<n;i++)
		{
			if(s2[i]==s1[p]&&!found[i])
			{
				found[i]=1;
				re[++k]=s1[i];
				p=i;
				break;
			}
		}
		j++;
	}
	for(i=k;i>=0;i--) cout<<re[i]; 
	return 0;
}