ChanceCase/inverseCap c+ 3

 #include <iostream>

#include <string>

int main() {

std::string stringa;

std::getline(std::cin, stringa);

for (size_t i { }; i < stringa.length(); i++) {

if (islower(stringa.at(i))) {

stringa.at(i)=toupper(stringa.at(i));

}else{

stringa.at(i)=tolower(stringa.at(i));

}

}

std::cout<<stringa;

return 0;

}