Codeforces刷题之路——131A cAPS lOCK

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本文介绍了一种处理因错误按下CAPSLOCK键而导致输入错误大小写的文字修正算法，并提供了Java实现示例。

wHAT DO WE NEED cAPS LOCK FOR?

Caps lock is a computer keyboard key. Pressing it sets an input mode in which typed letters are capital by default. If it is pressed by accident, it leads to accidents like the one we had in the first passage.

Let's consider that a word has been typed with the Caps lock key accidentally switched on, if:

either it only contains uppercase letters;
or all letters except for the first one are uppercase.

In this case we should automatically change the case of all letters. For example, the case of the letters that form words "hELLO", "HTTP", "z" should be changed.

Write a program that applies the rule mentioned above. If the rule cannot be applied, the program should leave the word unchanged.

Input

The first line of the input data contains a word consisting of uppercase and lowercase Latin letters. The word's length is from 1 to 100 characters, inclusive.

Output

Print the result of the given word's processing.

Examples

input
cAPS

output
Caps

input
Lock

output
Lock

题目大意：仅需考虑两种情况（1）全部为大写字母（2）除了第一个字符，其他都为大写字母。对于第一种情况，将其改为全部小写输出。对于第二种情况，将其改为仅有第一个字符大写，其他均为小写输出。

解题思路：题目大意已经很明确地指示出所需要考虑的两种情况，是一道水题。

以下为解题代码（java实现）

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner = new Scanner(System.in);
		String str = scanner.nextLine();
		char[] ch = str.toCharArray();
		boolean uppercase = false;
		boolean flag = false;
		if(ch[0] >= 'a' && ch[0] <= 'z'){
			flag = true;
			for(int i = 1; i < ch.length;i++){
				if(ch[i] >= 'A' && ch[i] <= 'Z'){
					flag = true;
					continue;
				}else{
					flag = false;
					break;
				}
			}
		}else{
			uppercase = true;
			for(int i = 1;i < ch.length;i++){
				if(ch[i] >= 'A' && ch[i] <= 'Z'){
					uppercase = true;
					continue;
				}else{
					uppercase = false;
					break;
				}
			}
		}
		if(flag){
			System.out.println(str.substring(0, 1).toUpperCase() + str.substring(1).toLowerCase());
		}else if(uppercase){
			System.out.println(str.toLowerCase());
		}else {
			System.out.println(str);
		}
	}
}