#include
int main()
{
char c[256];
int i=0;
while ((c[i++] = getchar()) != '\n');
c[i]='\0';
i=0;
printf ("%s", c);
while(c[i])
{
if ('a' <= c[i] && c[i] <= 'z')
{
c[i] -= 32;
}
else
if ('A' <= c[i] && c[i] <= 'Z')
{
c[i] += 32;
}
i++;
}
printf ("%s", c);
return 0;
}
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