#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
string str;
getline(cin,str);
for(int i=0; i< str.size(); i++) {
char ch = str[i];
if(ch>='a' && ch <='z'){
ch = ch - 'a' + 'A'; // lowercase to uppercase
}
else {
ch = ch - 'A' + 'a'; // uppercase to lowercase
}
str[i] = ch;
}
cout<<str;
return 0;
}
I2luY2x1ZGUgPGJpdHMvc3RkYysrLmg+CnVzaW5nIG5hbWVzcGFjZSBzdGQ7CgppbnQgbWFpbigpIHsKCS8vIHlvdXIgY29kZSBnb2VzIGhlcmUKCQoJc3RyaW5nIHN0cjsKCQoJZ2V0bGluZShjaW4sc3RyKTsKCQoJZm9yKGludCBpPTA7IGk8IHN0ci5zaXplKCk7IGkrKykgewoJCWNoYXIgY2ggPSBzdHJbaV07CgkJaWYoY2g+PSdhJyAmJiBjaCA8PSd6Jyl7CgkJCWNoID0gY2ggLSAnYScgKyAnQSc7IC8vIGxvd2VyY2FzZSB0byB1cHBlcmNhc2UKCQl9CgkJZWxzZSB7CgkJCWNoID0gY2ggLSAnQScgKyAnYSc7IC8vIHVwcGVyY2FzZSB0byBsb3dlcmNhc2UKCQl9CgkJc3RyW2ldID0gY2g7Cgl9CgkKCWNvdXQ8PHN0cjsKCQoJcmV0dXJuIDA7Cn0=