#include <iostream>
#include <string>
using namespace std;
int main(void) {
string str;
cin >> str;
int asciiDiff = 'a' - 'A';
for (int i = 0; i < str.size(); i++)
{
if (str[i] < 'a')
{
str[i] += asciiDiff;
}
else
{
str[i] -= asciiDiff;
}
cout << str[i];
}
cout << endl;
return 0;
}