text: f = open("yesterday.txt", "r")
  yesterday_lyric = ""
  while 1:
  	line = f.readline()
  	# print(line)
  	if not line:
  		break
  	yesterday_lyric = yesterday_lyric + line.strip() + "\n"
  	# print (yesterday_lyric)
  f.close()
  n_of_yesterday = yesterday_lyric.upper().count("yesterday")
  print ("Number of a Word 'Yesterday'" , n_of_yesterday)
  