#include <iostream>
#include <algorithm>

using namespace std;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    string s;
    cin >> s;

    for (int i = 0; i < s.length(); ++i) {
        int x = s[i];
        if (x >= 97) x -= 32;
        else x += 32;
        s[i] = x;
    }

    cout << s << endl;

    return 0;
}