msg = "hello 123 WORLD"
#统计长度和小写字母个数
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)
#替换并转小写
new_msg = msg.replace("WORLD", "Python")
result = new_msg.lower()
print("结果:", result)
bXNnID0gImhlbGxvIDEyMyBXT1JMRCIKI+e7n+iuoemVv+W6puWSjOWwj+WGmeWtl+avjeS4quaVsApsZW5ndGggPSBsZW4obXNnKQpsb3dlcl9jb3VudCA9IHN1bSgxIGZvciBjaCBpbiBtc2cgaWYgY2guaXNsb3dlcigpKQpwcmludCgi6ZW/5bqm77yaIiwgbGVuZ3RoKQpwcmludCgi5bCP5YaZ5a2X5q+N5Liq5pWw77yaIiwgbG93ZXJfY291bnQpCiPmm7/mjaLlubbovazlsI/lhpkKbmV3X21zZyA9IG1zZy5yZXBsYWNlKCJXT1JMRCIsICJQeXRob24iKQpyZXN1bHQgPSBuZXdfbXNnLmxvd2VyKCkKcHJpbnQoIue7k+aenO+8miIsIHJlc3VsdCkK