diff --git a/cpp09/ex02/main.cpp b/cpp09/ex02/main.cpp
index 9748723..366c4ee 100644
--- a/cpp09/ex02/main.cpp
+++ b/cpp09/ex02/main.cpp
@@ -6,17 +6,39 @@
 /*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/05/01 14:45:40 by rparodi           #+#    #+#             */
-/*   Updated: 2025/05/01 16:28:50 by rparodi          ###   ########.fr       */
+/*   Updated: 2025/05/02 16:06:17 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "PmergeMe.hpp"
+#include <cctype>
 #include <iostream>
 
+int check_input(int argc, char **argv) {
+	for (size_t i = 1; i < static_cast<size_t>(argc); i++) {
+		for (size_t j = 0; argv[i][j]; j++) {
+			if (!std::isdigit(argv[i][j]))
+				return (i);
+		}
+	}
+	return (0);
+}
+
 int	main(int argc, char **argv) {
 	if (DEBUG)
 		std::cerr << CLR_MAGENTA << "Warning: DEBUG_MODE is now enable" << CLR_RESET << std::endl << std::endl;
 	if (argc < 2)
 		std::cerr << CLR_RED << "Usage:\t" << argv[0] << " <number> <number> ..." << CLR_RESET << std::endl;
+	else {
+		if (DEBUG) {
+			std::cerr << CLR_CYAN << "Info: " << argv[0] << " have " << argc - 1 << " arguments !" << CLR_RESET << std::endl << std::endl;
+		}
+		int check = check_input(argc, argv);
+		if (check) {
+			std::cerr << CLR_RED << "Error: I only have to have number in parameter (args: " << check << ")" << CLR_RESET << std::endl;
+			if (DEBUG)
+				std::cerr << CLR_MAGENTA << "\tValue of args: [" << argv[check] << "]" << CLR_RESET << std::endl;
+		}
+	}
 	return (0);
 }