查找与替换（作业本P55）
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Description
输入共3行：
第1行是待处理的文本内容
第2行是查找的单词
第3行是替换的单词
通过查找替换操作后，输出处理之后的文本内容
Format
Input
I am a nurse, and she is a nurse, too!
nurse
teacher
Output
I am a teacher, and she is a teacher, too!
Samples
I am a nurse, and she is a nurse, too!
nurse
teacher
I am a teacher, and she is a teacher, too!
Limitation
1s, 1024KiB for each test case.