B1006

#include <stdio.h>

int main(){
    int n;
    scanf("%d", &n);
    int num = 0, ans[5];
    while( n!= 0){ // 将 n 的每一位存放到ans 数组中 
        ans[num++] = n%10;
        n /= 10;
    }

    for (int i = num-1; i>=0; i--){
        switch(i){
            case 2:
                for (int j=0; j<ans[i]; j++)
                    printf("B");
                break;
            case 1:
                for (int j=0; j<ans[i]; j++)
                    printf("S");
                break;
            case 0:
                for (int j=1; j<=ans[i]; j++)
                    printf("%d", j);
                break;
        }
    }
    return 0;
}