#include<stdio.h>
int main() {
    char buf[101] = {};
    scanf("%s",buf);
    for (char *p = buf; *p != 0; p += 1) {
        if('a'<=*p&&*p<='z'){
            *p-=('a'-'A');
        }else{
            *p+=('a'-'A');
        }
    }
    printf("%s",buf);
}