import gradio as gr

def calculator(text1, operation, text2):
    if operation == "add":
        return text1 + text2
    elif operation == "subtract":
        return text1 - text2
    elif operation == "multiply":
        return text1 * text2
    elif operation == "divide":
        return text1 / text2

demo = gr.Interface(
    calculator,
    [
        "text",
        gr.Radio(["add", "subtract", "multiply", "divide"]),
        "text"
    ],
    "text",
    live=True,
)
demo.launch()