print ("hello,world!")

 sentence = "yyyy"

 print (sentence.lower())

 print (sentence.upper())

 #print (sentenc)

 #hello,world!

 #yyyy

 #YYYY

 #Traceback (most recent call last):

 #      File "t.py", line 4, in <module>

 #          print (sentenc)

 #          NameError: name 'sentenc' is not defined

 print ('his name is "Li"')

 #his name is "Li"

 first = "a    "

 first_1 ="a"

 if first == first_1:

     print ("fit!")

 else:

     print ("wrong!")

 second = "b"

 print "\took"+first.rstrip() + "      " +second.title()+"!"

 #wrong!

 #        ooka          B!

 p = (2+3)**3

 Q = 0.1 *3

 print str(p)+""+str(Q)

 #1250.3