#include <cstdio>
#include <cstring>
using namespace std;
int main(int argc, char** argv) {
string str;
cin>>str;
string::iterator it=str.begin();
switch(str.size()){
case 3: for(int i=0;i<*it-'0';i++) cout<<"B"; it++;
case 2: for(int i=0;i<*it-'0';i++) cout<<"S"; it++;
case 1: for(int i=0;i<*it-'0';i++) cout<<i+1;
}
return 0;
}