#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main() {
	int i, j;
	string s;

	cin >> s;

	for (i = 0; i < s.length(); i++) {
		if (isupper(s[i]) != 0 ) {
			//cout << (char)((int)s[i] + 32);
			cout << (char)(s[i] + 32);
		}
		else {
			cout << (char)((int)s[i] - 32 );
		}
	}
	cout << endl;



	getchar();
	getchar();
	return 0;
}