#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
string s ="hello world";
string s1=s.substr(0,5);
reverse(s1.begin(),s1.end());
string s2=s.substr(6,5);
reverse(s2.begin(),s2.end());
s1.append(s2,0);
reverse(s1.begin(),s1.end());
cout<<s1;
return 0;
}
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