#include <iostream>
//#include <numeric>
//#include <vector>
//#include <cstdint>
#include <string>
using namespace std;

int main() {
	string str;
	cin >> str;

	for (int i = 0; i < str.length(); i++) {
		char c = str[i];

		if (c < 0x61) {
			c = c + 0x20;
		}
		else {
			c = c - 0x20;
		}
		cout << c;
	}



	return 0;

}