#include <stdio.h>
#include <ctype.h>
#include <string.h>
#define MAXN 5000+5
#define MAXM 200+5

typedef struct Dic{
 char str[MAXN];
 struct Dic* next;
}Dic;

Dic *head;
char word[MAXM];
int cnt=0;

int get_word();
void convert_word();
void insert_word();
int str_cmp(char*);

int main(){
  int i;
  Dic* p;
  freopen("data","r",stdin);
  while(get_word()){
  convert_word();
  insert_word();
  
  }
 
 p=head->next;
 for(i=0;i<cnt;i++){
 printf("%s\n",p->str);
 p=p->next;
 }

 return 0;

}

int get_word(){
 char c;
 int i=1;

 while((c=getchar())!=EOF)
  if(isalpha(c)){
    word[0]=c;

    c=getchar();
    while(isalpha(c)){
     word[i++]=c;
     c=getchar();
     }

    word[i]='\0';
    ungetc(c,stdin); //将新读取的第一个非字母字符退回
    return 1;       //读入一个单词，返回1
  }

 return 0;         //读入结束符，返回0

}

void convert_word(){
 int len=strlen(word);
 int i;

 for(i=0;i<len;i++)
  if(isupper(word[i]))
   word[i]= tolower(word[i]);
 
}

void insert_word(){
 int i,j;
 Dic *p,*temp,*q;

 if(cnt==0){
  head=(Dic*)malloc(sizeof(Dic));//第一个节点不放元素
  p=(Dic*)malloc(sizeof(Dic));
  head->next=p;
  strcpy(p->str,word);
  p->next=NULL;
  cnt++;
 }
 else{
  p=head;
  for(i=0;i<cnt;i++)
  if(str_cmp(p->next->str)<0){//插入节点
    temp=(Dic*)malloc(sizeof(Dic));
    temp->next=p->next;
    strcpy(temp->str,word);
    p->next=temp;
    cnt++;
   }
   else if(str_cmp(p->next->str)==0) return; //重复则退出插入
   else p=p->next;

  temp=(Dic*)malloc(sizeof(Dic));//比所有节点都大,在最后插入
  strcpy(temp->str,word);
  temp->next=p->next;
  p->next=temp;
  cnt++;
 }
 
 return ;
}

int str_cmp(char* p){
 int i;
 int len=strlen(p)>strlen(word)?strlen(word):strlen(p);
 for(i=0;i<=len;i++)//若比到字符串结尾仍相等，则相等
 if(p[i]<word[i])
 return 1;  //当前节点大于要插入节点
 else if(p[i]>word[i])
 return -1; 

 return 0;   //两节点相等
}