#include <iostream>
#include <string>
using namespace std;
int main()
{
	int i;

	char s[101],ans[101];
	cin >> s;
	for (i = 0; i <= 100; i++)
	{
		if (isupper(s[i]) != 0)
		{
			ans[i] = toupper(s[i]);
		}
		if (islower(s[i]) != 0)
		{
			ans[i] = tolower(s[i]);
		}
	}
	cout << ans << "\n";
	return 0;

}