#include<dirent.h>
#include<string.h>
#include<iostream>
using namespace std;

char* path_add(const char* initial, const char* d_name, char *path){
	strcpy(path, initial);
	strcat(path, "/");
	strcat(path, d_name);
	return path;
}

void traverse(const char* dpath, const char *extension){
	DIR *dir = opendir(dpath);
	struct dirent *de;
	char path[512];
	while(1){
		de = readdir(dir);
		if(!de)
			break;
		if(DT_DIR == de->d_type) {
			if(de->d_name[0] == '.' && (de->d_name[1] == '.' || de->d_name[1] == 0))
				continue;
			traverse(path_add(dpath, de->d_name, path), extension);
		} else if(DT_REG == de->d_type) {
			if(!extension || (!strcmp(extension, de->d_name + strlen(de->d_name) - strlen(extension)))){
				cout << path_add(dpath, de->d_name, path) << endl;
			}
		}
	}
}

int main(int argc, char ** argv){
	
	if(argc > 1){
		traverse(".", argv[1]);
	} else 
		traverse(".", 0);
	return 0;
}