#include <iostream>
using namespace std;
int main() {
	char s[100];
	char s_Answer[100];
	cin >> s;
	for (int i = 0; s[i] != '\0'; i++) {
		if (s[i] >= 'a')cout << (char)((int)s[i] - 32);
		//s_Answer[i] = (char)((int)s[i] - 32);
		else if (s[i] <= 'Z')cout << (char)((int)s[i] + 32);
		//s_Answer[i] = (char)((int)s[i] + 32);
	}
	cout << endl;
	//cout << s_Answer << endl;
}