字符串基础#

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class Solution:
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    # 使用双指针方法，交换首尾字符，逐步向中间靠拢
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    def reverseString(self, s: List[str]) -> None:
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        left, right = 0, len(s) - 1
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        while left < right:
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            # 交换左右字符
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            s[left], s[right] = s[right], s[left]
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            left += 1
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            right -= 1
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        return s  # 虽然题目为原地修改，但返回值方便测试

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class Solution:
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    def reverseStr(self, s: str, k: int) -> str:
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        # 将字符串转换成列表以便修改
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        s = list(s)
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        # 每2k个字符为一组，反转前k个字符
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        for i in range(0, len(s), 2 * k):
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            # 判断剩余字符是否大于k，决定反转范围
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            if i + k <= len(s):
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                s = self.reverse(s, i, i + k - 1)
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            else:
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                s = self.reverse(s, i, len(s) - 1)
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        # 将列表重新转换为字符串返回
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        return ''.join(s)
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    # 工具函数：反转字符串s在[left, right]区间的字符
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    def reverse(self, s: List[str], left: int, right: int) -> List[str]:
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        while left < right:
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            s[left], s[right] = s[right], s[left]
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            left += 1
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            right -= 1
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        return s

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import sys
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input = sys.stdin.read
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def main():
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    # 读取整段输入并去除首尾空白符
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    data = input().strip()
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    s = data
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    res = []
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    for char in s:
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        # 判断字符是否为数字，如果是则替换为字符串 "number"
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        if char.isdigit():
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            res.append("number")
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        else:
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            res.append(char)
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    # 将列表拼接成字符串并输出
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    print(''.join(res))
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if __name__ == "__main__":
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    main()