We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
API Gateway generates invalid IDs
Generated IDs in API Gateway resources look like `A-Z601A-Z47201`. They contain `A-Z` instead of letters.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `moto/apigateway/utils.py`
Content:
```
1 from __future__ import unicode_literals
2 import six
3 import random
4 
5 
6 def create_id():
7     size = 10
8     chars = list(range(10)) + ['A-Z']
9     return ''.join(six.text_type(random.choice(chars)) for x in range(size))
10
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/moto/apigateway/utils.py b/moto/apigateway/utils.py
--- a/moto/apigateway/utils.py
+++ b/moto/apigateway/utils.py
@@ -1,9 +1,10 @@
 from __future__ import unicode_literals
 import six
 import random
+import string
 
 
 def create_id():
     size = 10
-    chars = list(range(10)) + ['A-Z']
+    chars = list(range(10)) + list(string.ascii_lowercase)
     return ''.join(six.text_type(random.choice(chars)) for x in range(size))

{"golden_diff": "diff --git a/moto/apigateway/utils.py b/moto/apigateway/utils.py\n--- a/moto/apigateway/utils.py\n+++ b/moto/apigateway/utils.py\n@@ -1,9 +1,10 @@\n from __future__ import unicode_literals\n import six\n import random\n+import string\n \n \n def create_id():\n     size = 10\n-    chars = list(range(10)) + ['A-Z']\n+    chars = list(range(10)) + list(string.ascii_lowercase)\n     return ''.join(six.text_type(random.choice(chars)) for x in range(size))\n", "issue": "API Gateway generates invalid IDs\nGenerated IDs in API Gateway resources look like `A-Z601A-Z47201`. They contain `A-Z` instead of letters.\n", "before_files": [{"content": "from __future__ import unicode_literals\nimport six\nimport random\n\n\ndef create_id():\n    size = 10\n    chars = list(range(10)) + ['A-Z']\n    return ''.join(six.text_type(random.choice(chars)) for x in range(size))\n", "path": "moto/apigateway/utils.py"}], "after_files": [{"content": "from __future__ import unicode_literals\nimport six\nimport random\nimport string\n\n\ndef create_id():\n    size = 10\n    chars = list(range(10)) + list(string.ascii_lowercase)\n    return ''.join(six.text_type(random.choice(chars)) for x in range(size))\n", "path": "moto/apigateway/utils.py"}]}