#include <bits/stdc++.h>
using namespace std;
#define repeat(i,n) for (int i = 0; (i) < (n); ++ (i))

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