codeforces 131A cAPS lOCK(模拟水题)

A. cAPS lOCK
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time limit per test

2 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

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.

Sample test(s)

Input

cAPS

Output

Caps

Input

Lock

Output

Lock

╮(╯▽╰)╭这题题目一开始没看明白，导致wa几次。如果全是大写或者出了首字母是小写其他为大写，则转换为第一个字母大写，其他的小写 ，如果不是以上两种情况则不作处理。
╮(╯▽╰)╭水题还错。

#include 
#include
using namespace std;
int main()
{
    char c[101];
    int i,k,ans,s;
    while(cin>>c)
    {
        k=strlen(c);
        ans=s=0;
        for(i=1; i='A'&&c[i]<='Z')
                s++;
            else if(c[i]>='a'&&c[i]<='z')
                ans++;
        }
        if((ans==0&&s!=0)||k==1)
        {
            if(c[0]>='a'&&c[0]<='z')
                c[0]-=32;
            else if(c[0]>='A'&&c[0]<='Z')
                c[0]+=32;
            for(i=1; i