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#include <bits/stdc++.h>
using namespace std;

int main() {
	string s = "  Hello world!  ";
	s.erase(0, s.find_first_not_of(" \n\r\t"));
	cout << s;	/*Hello world!  */
	s.erase(s.find_last_not_of(" \n\r\t") + 1);
	cout << s;	/*Hello world!*/
	return 0;
}