msg = "hello 123 WROLD"
length = len(msg)
lower_count = sum(1 for ch in msg if ch.islower())
print("长度:",length)
print("小写字母个数:",lower_count)
new_msg = msg.replace("WROLD","Pyhon")
result = new_msg.lower()
print("结果:",result)
bXNnID0gImhlbGxvIDEyMyBXUk9MRCIKbGVuZ3RoID0gbGVuKG1zZykKbG93ZXJfY291bnQgPSBzdW0oMSBmb3IgY2ggaW4gbXNnIGlmIGNoLmlzbG93ZXIoKSkKcHJpbnQoIumVv+W6pjoiLGxlbmd0aCkKcHJpbnQoIuWwj+WGmeWtl+avjeS4quaVsDoiLGxvd2VyX2NvdW50KQoKbmV3X21zZyA9IG1zZy5yZXBsYWNlKCJXUk9MRCIsIlB5aG9uIikKcmVzdWx0ID0gbmV3X21zZy5sb3dlcigpCnByaW50KCLnu5Pmnpw6IixyZXN1bHQp