旧键盘上坏了几个键，于是在敲一段文字的时候，对应的字符就不会出现。现在给出应该输入的一段文字、以及坏掉的那些键，打出的结果文字会是怎样？

输入格式：

输入在 2 行中分别给出坏掉的那些键、以及应该输入的文字。其中对应英文字母的坏键以大写给出；每段文字是不超过 105 个字符的串。可用的字符包括字母 [a-z, A-Z]、数字 0-9、以及下划线 _（代表空格）、,、.、-、+（代表上档键）。题目保证第 2 行输入的文字串非空。

注意：如果上档键坏掉了，那么大写的英文字母无法被打出。

输出格式：

在一行中输出能够被打出的结果文字。如果没有一个字符能被打出，则输出空行。

输入样例：

7+IE.
7_This_is_a_test.

输出样例：

_hs_s_a_tst

编程语言：Python

解题思想：

1.将实际输入的文字中的坏键替换掉

2.针对坏键中的英文字母，将实际输入的文字中的该字母及其大写字母替换掉

3.如果坏键中有+键，则将实际输入的文字中的所有大写字母替换掉

时间复杂度：O(N)

代码如下：

DamageKey = list(input())  # 将每个坏键存放为列表元素
RealKey = input()  # 实际输入的文字
 
for i in range(len(DamageKey)):  # 遍历每个坏键元素
    RealKey = RealKey.replace(DamageKey[i], '')  # 将对应的坏键替换为空
    if str(DamageKey[i]).isalpha():  # 如果坏键是字母
        RealKey = RealKey.replace(str(DamageKey[i]).upper(), '')  # 将该字母的大写替换掉
        RealKey = RealKey.replace(str(DamageKey[i]).lower(), '')  # 将该字母的小写替换掉
 
if '+' in DamageKey:  # 上档键也是坏键
    for i in range(len(RealKey)):  # 逐个遍历实际输入的文字
        if str(RealKey[i]).isupper():  # 如果该文字是大写
            RealKey = RealKey.replace(str(RealKey[i]), '#')  # 将该文字暂时替换为#号，如果直接替换为空，会导致字符串长度改变，导致循环条件错误
RealKey = RealKey.replace('#', '')  # 再将#替换为空
 
print(RealKey)

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PAT乙级:1033 旧键盘打字