#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
using namespace std;
typedef long long int ll;

int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	string s; cin >> s;
	for(char c:s){
		if('a'<=c&&c<='z'){
			cout << (char)(c+('A'-'a')) ;
		}
		else{
			cout << (char)(c+('a'-'A'));
		}
	}
	cout << endl;
}