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i have some clues on it , but ...
recursive bactracink , traversing the three on his longness and pushing one by one in stack , or maybe a bunch and boud alghoritm.

#include <string>
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
string name("HEEEELLLLPPPPP");
cout << name[7];
getch();
}