package com.test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class SwitchCase {
public static void main(String[] args) throws IOException{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String line = br.readLine();
for (int i = 0; i < line.length(); i++) {
char ch = line.charAt(i);
if(ch>=97&&ch<=122){//小写转大写。
ch = (char)(ch-32);
} else if(ch>=65&&ch<=90){//大写转小写。
ch = (char)(ch+32);
}
System.out.print((char)ch);
}
br.close();//关流
}
}
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