#coding=utf-8
lexicons=["the","be","of","and","A","to","in","he","have","it","that","for","they","I","with","as","not","on","she","at","by","this","we","you","do","but","from","or","which","one","would","all","will","there","say","who","make","when","can"]
while True:
 startLetter=raw_input("輸入一個字母，列出所有以此字母開頭的單詞:")
 if len(startLetter)!=1:
 print "必須是一個字母"
 else:
 reLexicons=[] #結果列表
 for x in xrange(len(lexicons)):
  lexicon=lexicons[x]
  if lexicon[0].lower()==startLetter.lower():#都轉為小寫后比較 開頭字母不區(qū)分大小寫
  reLexicons.append(lexicon)
 if len(reLexicons)==0:
  print "沒有結果"
 else:
  for x in xrange(len(reLexicons)):
  print reLexicons[x]

#coding=utf-8
'''
邊遍歷，邊構造 key value 
'''
lexicons=["the","be","of","and","A","to","in","he","have","it","that","for","they","I","with","as","not","on","she","at","by","this","we","you","do","but","from","or","which","one","would","all","will","there","say","who","make","when","can"]
lexiconDict={}
#分類 保存字典中
lexiconLen=len(lexicons)
for x in xrange(len(lexicons)):
 lexicon=lexicons[x]
 startLetter=lexicon[0]
 dictLexicons=lexiconDict.get(startLetter,[])
  #空列表說明沒有Key 則添加Key 否則追加Key對應的Value
 if len(dictLexicons)==0:
 lexiconDict[startLetter]=[lexicons[x]]
 else:
 dictLexicons.append(lexicons[x])
while True:
 startLetter=raw_input("輸入一個字母，列出所有以此字母開頭的單詞:")
 if len(startLetter)!=1:
 print "必須是一個字母"
 else:
 lexicons=lexiconDict.get(startLetter.lower(),[])
 if len(lexicons)==0:
  print "沒有結果"
 else:
  for x in lexicons:
  print x