print('hello world')

print('hello world', 'this is a first ', 'how old are you!')
print('200+5000 =', 200 + 5000)
name = input('please enter your name:')
print("hello,", name , '欢迎来到python的世界')

print('1024 * 768 = ',1024 * 768)
print('I\'m \"OK\"!')