def front_back(str):
  if len(str) == 1:
    return str
  else:
    n = len(str)
    new_list = list(str)
    a = new_list[0]
    b = new_list[n-1]
    new_list.remove(new_list[0])
    new_list.remove(new_list[n-2])
    new_list.append(a)
    new_list.insert(0,b)
    new_string = "".join(new_list)
    return new_string