diff --git a/README.md b/README.md
index fa0237d..d0ab349 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,3 @@
 # OpenBootCampPython
 Repository to store Python boot camp.
+* Ejercicio 9.B: En este segundo ejercicio, tenéis que crear una aplicación que obtendrá los elementos impares de una lista pasada por parámetro con filter y realizará una suma de todos estos elementos obtenidos mediante reduce.
diff --git a/src/exercisenine/sumarimpares.py b/src/exercisenine/sumarimpares.py
new file mode 100644
index 0000000..bdcf2c0
--- /dev/null
+++ b/src/exercisenine/sumarimpares.py
@@ -0,0 +1,75 @@
+from functools import reduce
+
+
+def isNumeric(lista: list[str]) -> bool:
+    """Check if a list of strings are numeric
+    :param lista: list of strings to check
+    :type lista: list[str]
+    :return: true if all elements in the list are numeric, false otherwise
+    :rtype: bool
+    """
+    return all(x.isnumeric() for x in lista)
+
+
+def strToInt(lista: list[str]) -> list[int]:
+    """Transform a list of strings to a list of integers
+    :param lista: list of strings to transform
+    :type lista: list[str]
+    :return: list of strings transformed in integer
+    :rtype: list[int]
+    """
+    return list(int(x) for x in lista)
+
+
+def isImpar(a: int) -> bool:
+    """Check if a number is odd.
+    :param a: number to check
+    :type a: int
+    :return: true if the numbers is odd, false otherwise
+    :rtype: bool
+    """
+    if a % 2 != 0:
+        return True
+    return False
+
+
+def getImpares(lista: list[int]) -> list[int]:
+    """Function that filter a list of integers and take odd numbers
+    :param lista: list of integers to filter
+    :type lista: list[int]
+    :return: list filtered with odd numbers
+    :rtype: list[int]
+    """
+    return list(filter(isImpar, lista))
+
+
+def sumar(a: int, b: int) -> int:
+    """Function to add two numbers
+    :param a: first operand
+    :type a: int
+    :param b: second operand
+    :type b: int
+    :return: addition of the operands
+    :rtype: int
+    """
+    return a + b
+
+
+def sumarImpares(lista: list[str]) -> tuple[int, int, list[int]]:
+    """Function that check if a list of strings are numerics,
+    then check if the list is not empty, take the odd numbers of the list,
+    finally make arithmetic addition with all odd numbers of the list
+    :param lista: list of integers
+    :type lista: list[str]
+    :return: error -> 0 if correct, 1 if the list is empty, 2 if the list is not numeric
+             result of the operation
+             list of the operands
+    :rtype: tuple[int, int, list[int]]
+    """
+    if isNumeric(lista):
+        lista = getImpares(strToInt(lista))
+        if len(lista) != 0:
+            return 0, reduce(sumar, lista), lista
+        else:
+            return 1, 1, []
+    return 2, 1, []
diff --git a/src/main.py b/src/main.py
index a47b6a3..6664dd1 100644
--- a/src/main.py
+++ b/src/main.py
@@ -1,10 +1,39 @@
-def main():
-    """Main script for pythonBootCamp project
-    :return: None
-    :rtype: NoneType
+from sys import argv
+
+from exercisenine.sumarimpares import sumarImpares
+
+
+def showCalculation(lista: list[int], resultado: int):
+    """Function that show in terminal the operation
+    :param lista: list of digit to operate
+    :type lista: list[int]
+    :param resultado: result of the operation
+    :type resultado: int
+    """
+    msg = str(lista[0])
+    for digito in lista[1:len(lista)]:
+        msg += ' + '
+        msg += str(digito)
+    print(f'{msg} = {resultado}')
+
+
+def main(args, argc):
+    """Main script for exercise nine B.
     """
-    pass
+    if argc < 1:
+        print('Introduzca algún digito entero')
+        exit(1)
+    error, resultado, impares = sumarImpares(args)
+    if error == 0:
+        showCalculation(impares, resultado)
+        exit(error)
+    elif error == 1:
+        print('No hay elementos que sumar')
+        exit(error)
+    elif error == 2:
+        print('Error, hay elementos no numéricos')
+        exit(error)
 
 
 if __name__ == '__main__':
-    main()
+    main(argv[1:len(argv)], len(argv[1:len(argv)]))