#include <stdio.h>
#include <ctype.h>

using namespace std;

int main()
{
    char pass[100];
    scanf("%s", pass);

    for (int i = 0; i < 100; i++)
    {
        char c = pass[i];

        if (isupper(c))
        {
            pass[i] = tolower(c);
        }
        else
        {
            pass[i] = toupper(c);
        }
    }

    printf("%s", pass);
}