#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cctype>
#include<cstdlib>
#include<algorithm>
#include<bitset>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<ctime>
#include<complex>
#include<functional>
#include<climits>
#include<cassert>
#include<iterator>
#include<valarray>
//#include<bits/stdc++.h>
using namespace std;
//#include <iostream>
//#include <cstdlib>
#include <dirent.h>

int main()
{
	const char* path = "/bin";
	DIR *dp;       // ディレクトリへのポインタ
	dirent* entry; // readdir() で返されるエントリーポイント

	dp = opendir(path);
	if (dp == NULL) exit(1);
	do {
		entry = readdir(dp);
		if (entry != NULL)exit(0);
		stringstream aa;
		aa << (entry->d_name);
		if (aa.str()[0] == '.'){
			continue;
		}
		cout << aa.str()[0] << endl;
	} while (entry != NULL);
	return 0;
}