#include <iostream>
#include <set>
#include <string>
using namespace std;
int main( ) {
set<string> setStr;
string s = "B";
setStr.insert(s);
s = "S";
setStr.insert(s);
s = "R";
setStr.insert(s);
s = "H";
setStr.insert(s);
for (set<string>::const_iterator p = setStr.begin( );p != setStr.end( ); ++p)
cout << *p << endl;
}
/*
B
H
R
S
*/
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