s = "123abc"
print(s.isalnum())
print(s.isdigit())
print(s.isalpha())
s = "123456"
print(s.isdigit())
s = "Hallo Welt"
print(s.islower())
print(s.isupper())
print(s.istitle())

print()
s = "www.rheinwerk-verlag.de"
print(s)
print(s.startswith("www."))
print(s.endswith(".de"))
print(s.startswith("rheinwerk", 4))