#include<stdio.h>
int main()
{
int ch = ' ';
while ((ch = getchar()) != EOF)
{
if (ch >= 'a' && ch <= 'z')
{
putchar(ch - 32);
}
else if (ch >='A' && ch <= 'Z')
{
putchar(ch + 32);
}
else
{
putchar(ch);
}
}
system("pause");
return 0;
}