프로그램 실행환경에서 런타임때 입력받기
✏️ 기본형: str
name = input("Enter your name")
grade = input("Enter your grade")
print(name, grade)
first_num = int(input("enter number: "))
second_num = int(input("enter number: "))
total = first_num + second_num
print(total)
print("Firstname - {0}, Lastname - {1}".format(
input("enter your fist name: "), input("enter your last name: ")))