#include <bits/stdc++.h>

using namespace std;

int main() {
  map<char, char> m;
  for (int i = 0; i < 26; ++i) {
    m[i + 'a'] = i + 'A';
    m[i + 'A'] = i + 'a';
  }
  string s;
  cin >> s;
  int n = s.size();
  for (int i = 0; i < n; ++i) {
    s[i] = m[s[i]];
  }
  cout << s << '\n';
  return 0;
}