print("Enter your first name.")
first_name = raw_input()
print("Enter your last name.")
last_name = raw_input()
print("Enter your grade level.")
grade = int(raw_input())

my_file = open("students.dat", "a")
my_file.write(first_name + ' ' + last_name + ' ' + str(grade) + '\n')
my_file.close()