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技术 2022年11月23日
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cAPS lOCK

Time Limit:500MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u

Submit Status Practice CodeForces 131A

Description

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 Input

Input

cAPS

Output

Caps

Input

Lock

Output

Lock
 #include <stdio.h>
#include <string.h>
int main()
{
char a[];
int i,j,k;
while(scanf("%s",a)!=EOF)
{
int flg=;
int l=strlen(a);
for(i=;i<l;i++)
{
if('A'<=a[i] && a[i]<='Z')
k=;
else
{
flg=;
break;
}
}
//printf("%d\n",flg);
if(flg!=)
printf("%s\n",a);
else
{
if('A'<=a[] && a[]<='Z')
printf("%c",a[]+);
else
printf("%c",a[]-);
for(i=;i<l;i++)
printf("%c",a[i]+);
}
printf("\n");
}
return ;
}
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