#include <string>
#include <iostream>
#include <regex>
using namespace std;
 
int main() {
	std::regex r("\\[(\\d+)]");
	std::string s = "SUCCESSFUL CANDIDATES ARE INDICATED WITHIN PARANTHESIS AGAINST THEIR ROLL NUMBER AND THE EXTRA MARKS GIVEN [MAXIMUM FIVE MARKS] TO RAISE THEIR GRADES IN HARDSHIP CASES ARE INDICATED WITH PLUS[+] SIGN AND\nGRACE MARKS CASES ARE INDICATED WITH CARET[+] SIGN\n\n\n600023[545]         600024[554]         600031[605]              600052[560]              ***********\n\nGrade : D\nGovt. Degree Boys College, Surjani Town\n\n\n600060[877]         ***********                   ***********                   ***********                   ***********";
	for(std::sregex_iterator i = std::sregex_iterator(s.begin(), s.end(), r);
                             i != std::sregex_iterator();
                             ++i)
    {
        std::smatch m = *i;
        std::cout << m[1].str() << '\n';
    }
	return 0;
}
 

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