diff --git a/calculator.py b/calculator.py
index cac6635..d0310d1 100644
--- a/calculator.py
+++ b/calculator.py
@@ -1,8 +1,12 @@
 # Custom function to read the two numbers.
 def read_numbers():
-    num1 = float(input('Enter first number: '))
-    num2 = float(input('Enter second number: '))
-    return num1, num2
+    while True:
+	try:
+	    num1 = float(input('Enter first number: '))
+   	    num2 = float(input('Enter second number: '))
+    	    return num1, num2
+	except ValueError:
+            print("Error: Por favor, introduce solo numeros validos")
 
 # Simple menu.
 print('Welcome to the calculator!')
@@ -45,4 +49,4 @@ def read_numbers():
         elif choice == '5':
             break
     else:
-        print('Invalid Input')
\ No newline at end of file
+        print('Invalid Input')