<gh_stars>0
temp = "Hello world!"
print(temp)
print(temp.upper())
print(temp.replace("W","a"))
print(temp.find("W"))
print(len(temp))
msgs = temp.split()
print(msgs)

temp = "Hello world!"
print(temp)
print(temp.upper())
print(temp.replace("W","a"))
print(temp.find("W"))
print(len(temp))
msgs = temp.split()
print(msgs)