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