#include <stdio.h>
#include <stdlib.h>

main (char argc, char *argv[])
	{
	int goalnum;
	char word[100];
	char lettercount[26];
	int i,cur;

	goalnum=atoi(argv[1]);
	for (i=0;i<26;i++)
		lettercount[i]=0;
  while (gets(word))
		{
		for (i=0;word[i];i++)
			{
			if ('a'<=word[i] && word[i]<='z')
				lettercount[word[i]-'a']++;
			if ('A'<=word[i] && word[i]<='Z')
				lettercount[word[i]-'A']++;
			}
		cur=0;
		for (i=0;i<26;i++)
			if (lettercount[i]>0)
				{
				lettercount[i]=0;
				cur++;
				}
		if (cur==goalnum)
			printf("%s\n",word);
		}
	}