#include <bits/stdc++.h>
using namespace std;
#define REP(i,n) for (int i = 0; i < n; ++i)
typedef long long ll;
// Welcome to my source code!

int main() {
    string c, s;
    cin >> c;
    for (char x : c) {
        s += islower(x) ? toupper(x) : tolower(x);
    }
    cout << s << endl;
}