Problema 3

def scrool(string):
  #@param string: string; Stringa inserita dall'utente

  for i in range(0, len(string) - 1):
    for j in range(i + 1, len(string)):
      if control(string, i, j):
        string = string[0:j] + "*" + string[j + 1:len(string)]
  print string


def control(text, z, k):
  #@param text: string;
  #@param z: int;
  #@param k: int;

  if text[z] == text[k] and text[z] != " ":
    return True
  else:
    return False