#include <stdio.h>

main() {
    char str[128];
    
    scanf("%s", str);
    
    for (int i=0; i<128; i++) {
        if (str[i] == 0)
            break;
        if (str[i] >= 'a')
            printf("%c", str[i] - ('a' - 'A'));
        else
            printf("%c", str[i] + ('a' - 'A'));
    }
}