diff --git a/.github/.keep b/.github/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/.github/workflows/classroom.yml b/.github/workflows/classroom.yml
new file mode 100644
index 0000000..81a4cb0
--- /dev/null
+++ b/.github/workflows/classroom.yml
@@ -0,0 +1,30 @@
+name: Autograding Tests
+'on':
+- workflow_dispatch
+- repository_dispatch
+permissions:
+  checks: write
+  actions: read
+  contents: read
+jobs:
+  run-autograding-tests:
+    runs-on: ubuntu-latest
+    if: github.actor != 'github-classroom[bot]'
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    - name: caesar test
+      id: caesar-test
+      uses: classroom-resources/autograding-command-grader@v1
+      with:
+        test-name: caesar test
+        setup-command: pip install pytest
+        command: pytest tests.py
+        timeout: 10
+        max-score: 100
+    - name: Autograding Reporter
+      uses: classroom-resources/autograding-grading-reporter@v1
+      env:
+        CAESAR-TEST_RESULTS: "${{steps.caesar-test.outputs.result}}"
+      with:
+        runners: caesar-test
diff --git a/README.md b/README.md
index 3564f70..404fd0c 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
+[![Open in Visual Studio Code](https://classroom.github.com/assets/open-in-vscode-2e0aaae1b6195c2367325f4f02e2d04e9abb55f0b24a779b69b11b9e10269abc.svg)](https://classroom.github.com/online_ide?assignment_repo_id=15451420&assignment_repo_type=AssignmentRepo)
 # Caesar Cipher Exercise
 Code Louisville Python programming exercise.
 
diff --git a/cipher.py b/cipher.py
index 0e772db..b044116 100644
--- a/cipher.py
+++ b/cipher.py
@@ -1 +1,21 @@
 # add your code here
+from itertools import cycle
+alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
+
+def matchingLetter(letter):
+    if letter in alphabet :
+        longitud = alphabet.index(letter)+5
+        if longitud > 25:
+            letter = alphabet[longitud - 26]
+        else:
+            letter = alphabet[alphabet.index(letter)+5]
+    return letter    
+
+
+user_text = input('Please enter a senctence: ')
+user_text = user_text.lower()
+
+resp = ""
+for let in user_text:
+    resp = resp + matchingLetter(let)
+print('The encrypted sentence is:', resp)