#include <iostream>
#include <string.h>

using namespace std;

int main() {
	char buffer[100] = "\0";
	cin >> buffer;

	for (auto i = 0; i != strlen(buffer); ++i) {
		if ('a' <= buffer[i] && buffer[i] <= 'z') {
			cout << (char)(buffer[i] + ('A' - 'a'));
		}
		else if ('A' <= buffer[i]&& buffer[i] <= 'Z') {
			cout << (char)(buffer[i] + ('a' - 'A'));
		}
	}
	cout << endl;
	return 0;
}