stnsrietn

#include <iostream>
#include <string>
#include <cstring>
using namespace std;
string s(string test){
    string fin = test;
    for(int a = strlen(test.c_str())-1;a>=0;a--)
        fin += test[a];
    return fin;
}
int main(){
    cout<<s("Hello")<<endl;
}