#include <sys/types.h>
#include <dirent.h>
#include "bits/stdc++.h"
using namespace std;
int main()
{
DIR* dp=opendir("/bin");
if (dp!=0)
{
    struct dirent* dent;
    do{
        dent = readdir(dp);
        if (dent!=0)cout<<dent->d_name<<endl;
    }while(dent!=0);
    closedir(dp);
}
     return 0;
}