删除小写字母并移动字符串末尾的标点符号

import re

def remove_lowercase_and_move_punctuation(s):
    # 删除小写字母
    s = re.sub('[a-z]', '', s)

    # 移动标点符号
    punctuation = ''
    for c in s:
        if not c.isalnum() and not c.isspace():
            punctuation += c

    s = punctuation + re.sub('[^a-zA-Z0-9\s]', '', s)

    return s

# 测试
s = "Hello, World! This is a test string."
result = remove_lowercase_and_move_punctuation(s)
print(result)