diff --git a/.github/workflows/github-os-sample.yml b/.github/workflows/github-os-sample.yml
index e93669d..31e7f1e 100644
--- a/.github/workflows/github-os-sample.yml
+++ b/.github/workflows/github-os-sample.yml
@@ -8,6 +8,7 @@ on:
         default: ubuntu-latest
 jobs:
   main:
-    runs-on: ${{ github.event.inputs.os }}
+    runs-on: ubuntu-latest
+    # runs-on: ${{ github.event.inputs.os }}
     steps:
-      - run: echo 'hello world!'
+      - run: "echo '${{ github.event.inputs.os }}: hello world!'"