text: #moziretu.py
  #with open(txt_file) as f:
  '''import sys
  with open('popularname.txt') as sys:
      retu = sys.readlines()#一行ずつ読み込み。
      retu_list = []#ここにぶち込み
      for i in retu:
          retu_list.append(i[0])#頭の文字だけ取り出す
      print(sorted(list(set(retu_list))))#文字列種類のソートで昇順に並べる
  #'''
  #名前でAから呼び出しするほう
  names = set()
  with open('popularname.txt') as f:
      for line in f:
          name = line.split('\t')[0]
          names.add(name)
  names = sorted(names)
  
  for name in names:
      print(name)
  #'''
  #unixコマンド
  #cut -f 1 popularname.txt | sort -s | uniq 