include<bits/stdc++.h>

using namespace std;

int main() {
string s;
getline(cin,s);
for (int i = 0; i < s.size(); i++) {
if (s[i] >= 'a' && s[i] <= 'z') {
s[i] -= 32;

    }
        else s[i] += 32;

}

cout << s;
return 0;

}