#include"stdio.h"
void main()
{
char ch1,ch2;
ch1=getchar();
if(ch1>64&&ch1<92)
printf("%c",ch1+32);
else if(ch1>96&&ch1<122)
printf("%c",ch1-32);
else
printf("the char you input is wrong!");
}
void main()
{
char ch1,ch2;
ch1=getchar();
if(ch1>64&&ch1<92)
printf("%c",ch1+32);
else if(ch1>96&&ch1<122)
printf("%c",ch1-32);
else
printf("the char you input is wrong!");
}