diff --git a/ex04/main.cpp b/ex04/main.cpp
index 1296543..db793ab 100644
--- a/ex04/main.cpp
+++ b/ex04/main.cpp
@@ -6,7 +6,7 @@
 /*   By: aortigos <aortigos@student.42malaga.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/09/06 14:44:18 by aortigos          #+#    #+#             */
-/*   Updated: 2025/09/06 15:18:39 by aortigos         ###   ########.fr       */
+/*   Updated: 2025/09/07 19:44:43 by aortigos         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -26,18 +26,23 @@ int	main(int argc, char **argv)
 		s1 = argv[2];
 		s2 = argv[3];
 		line = "";
+		
 		std::ifstream infile(filename.c_str(), std::ifstream::in);
-		std::ofstream outfile((filename + ".replace").c_str());
-
-		if (!infile.is_open() || !outfile.is_open())
+		if (!infile.is_open())
 		{
-			std::cout << "Ha ocurrido un error en los archivos" << std::endl;
+			std::cout << "Ha ocurrido un error en el infile" << std::endl;
+			return (1);
+		}
+
+		std::ofstream outfile((filename + ".replace").c_str());
+		if(!outfile.is_open())
+		{
+			std::cout << "Hubo un error en el outfile" << std::endl;
 			return (1);
 		}
 
 		while (std::getline(infile, line)) {
 			size_t	pos = 0;
-
 			while ((pos = line.find(s1, pos)) != std::string::npos)
 			{
 				line.erase(pos, s1.length());
@@ -46,13 +51,10 @@ int	main(int argc, char **argv)
 			}
 			outfile << line << std::endl;
 		}
-
 		infile.close();
 		outfile.close();
-		
 	} else {
 		std::cout << "Uso: ./sed <filename> <s1> <s2>" << std::endl;
 	}
-
 	return (0);
 }
\ No newline at end of file