Update app.py

app.py

@@ -8,11 +8,12 @@ def greet(text):
     time.sleep(20)
     print('end sleep')
     print(text)
+    return "echo " + text
 
 with gr.Blocks() as demo:
     input_text = gr.Textbox()
-    #output_text = gr.Textbox()
+    output_text = gr.Textbox()
     btn = gr.Button("Run")
-    btn.click(fn=greet, inputs=input_text)
+    btn.click(fn=greet, inputs=input_text, output_text)
 
 demo.launch()