while x == "i" :
  print ("Please Enter Your Usename And Pasword!")
  luser = input("USERNAME - ")
  Lpass = input("PASSWORD - ")
  with open("USERNAME.txt") as ucc:
   for num, line in enumerate(ucc, 1):
    if luser in line:
     print (int(num))

  uc = open( "USERNAME.txt", "r")
  pc = open( "PASSWORD.txt", "r")

  u = uc.readline(int(num))
  pw = pc.readline(int(num))
  print (u)
  print (pw)