/* This program reads a string from standard input, and then changes its characters by
   switching upper and lower-case letters. */

#include <iostream>
using namespace std;

int main()
{
  string s;
  size_t i;

  if (cin >> s) {
    for (i = 0; i < s.size(); i++) {
      if (s[i] >= 'A' && s[i] <= 'Z') {             // If upper-case, change to lower-case
        s[i] += ('a'-'A');
      } else if (s[i] >= 'a' && s[i] <= 'z') {      // If lower-case, change to upper-case
        s[i] += ('A'-'a');
      }
    }
    cout << "Swapped upper and lower-case: " << s << "." << endl;
  }
  return 0;
}