#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;





int main()
{

    int Q;
    Q = 1;
    //cin >> Q;


    while (Q--) {
        string p;
        cin >> p;
        int a = 'A' - 'a';
        for (int i = 0; i < p.size(); i++) {
            if (p[i] >= 'a' && p[i] <= 'z') {
                cout << char(p[i] + a);
            }
            else cout << char(p[i] - a);
        }
        
    }
    return 0;
}