def assign_letter_grade(score):
  if score >= 85.0:
    return "A"
  elif (score>=75.0) and (score < 85.0):
    return "B"
  elif (score>=65.0) and (score < 75.0):
    return "C"
  elif (score>=55.0) and (score < 65.0):
    return "D"
  else:
    return "F"

def calculate_score(score1,score2,score3):
  total = score1*0.25+score2*0.35+score3*0.4
  return total

std_no = []
std_name = []
std_letter = []
std_grd = []

std_number = int(input("How many number student will you add? : "))

for i in range(0,std_number):
  id_no = int(input("Enter the id number of student: "))
  name = input("Enter the Name and Surname of Student:")
  score1 = float(input("Enter the Score1: "))
  score2 = float(input("Enter the Score2: "))
  score3 = float(input("Enter the Score3: "))

  avg_score = calculate_score(score1, score2, score3)
  letter_grade = assign_letter_grade(avg_score)

  std_no.append(id_no)
  std_name.append(name)
  std_grd.append(avg_score)
  std_letter.append(letter_grade)

print(*std_name)

for k in range(0,std_number):
  print("""
        Id             : {}
        Name - Surname : {}
        Avg. Grade     : {}
        Letter Grade   : {} 

  """.format(std_no[k], std_name[k], std_grd[k], std_letter[k]))