import java.util.*;
public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int b = n / 100;
        int s = n / 10 % 10;
        int g = n % 10;
        for(int i = 0 ; i < b ; i++) {
            System.out.print("B");
        }
        for(int i = 0 ; i < s ; i++) {
            System.out.print("S");
        }
        for(int i = 1 ; i <= g ; i++) {
            System.out.print(i);
        }
    }
}