#include<stdio.h>
#include<string.h>
int main() {
char b[1002];
scanf("%[^\n]", &b);
for (int i=0; b[i]!=0; i++) {
if (b[i]>='a' && b[i] <= 'z'){
b[i] += ('A'-'a');
}
else {
b[i]+=('a' - 'A');
}
}
printf("%s", b);
}
I2luY2x1ZGU8c3RkaW8uaD4KI2luY2x1ZGU8c3RyaW5nLmg+CmludCBtYWluKCkgewoJY2hhciBiWzEwMDJdOwoJc2NhbmYoIiVbXlxuXSIsICZiKTsKCWZvciAoaW50IGk9MDsgYltpXSE9MDsgaSsrKSB7CgkJaWYgKGJbaV0+PSdhJyAmJiBiW2ldIDw9ICd6Jyl7CgkJYltpXSArPSAoJ0EnLSdhJyk7CgkJfQoJCWVsc2UgewoJCQliW2ldKz0oJ2EnIC0gJ0EnKTsKCQl9Cgl9CglwcmludGYoIiVzIiwgYik7Cn0=