#include <iostream>
using namespace std;
main()
{
char a;
cin>>a;
if (a<='z'&&a>='a') a-=32;
else if (a<='Z'&&a>='A') a+=32;
cout<<a;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwptYWluKCkKewpjaGFyIGE7CmNpbj4+YTsKaWYgKGE8PSd6JyYmYT49J2EnKSBhLT0zMjsKZWxzZSBpZiAoYTw9J1onJiZhPj0nQScpIGErPTMyOwpjb3V0PDxhOwp9