#include <iostream>
#include <string.h>
using namespace std;

int main() {
    char a[] = "";
    cin >> a;
    for(int i = 0; i < strlen(a); i++){
        if(a[i] < 'a'){
            a[i] += 0x20;
            cout <<  a[i];
        }
        else{
            a[i] -= 0x20;
            cout <<  a[i];
        }
    }
    cout << "\n";
    return 0;
}