#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 

int main()
{

  CIN( string , S );
  const uint& size = S.size();
  const char a = 'a';
  const char A = 'A';
  const int shift = a - A;
  
  for( ll i = 0 ; i < size ; i++ ){

    const char c = S[i];
    char C;

    if( c < 'a' ){

      C = c + shift;

    } else {

      C = c - shift;

    }
    
    cout << C;
    
  }

  cout << endl;
  return 0;

}