#include <iostream>
using namespace std;

int main()
{
    char s[101];
    cin >> s;

    for(int i = 0; s[i] != '\0'; i++){
        if((s[i] >= 'a') && (s[i] <= 'z'))
            s[i]-=32;
        else
            s[i]+=32;
    }

    cout << s << endl;

    return 0;
}