diff --git a/src/workers/GeoCaptchaSolver.js b/src/workers/GeoCaptchaSolver.js
index 0bb365c..3eaea56 100644
--- a/src/workers/GeoCaptchaSolver.js
+++ b/src/workers/GeoCaptchaSolver.js
@@ -10,6 +10,7 @@ const CAPTCHA_CONTAINER = "#captcha-container";
 const WAV_URL_REGEX = "https:.+.wav";
 const re = new RegExp(WAV_URL_REGEX);
 const SPEECH_TO_TEXT_HOST = "http://appointment.lpaconsulting.fr:8000"
+
 // const SPEECH_TO_TEXT_HOST = "http://127.0.0.1:8000"
 
 function delay(delayInMs) {
@@ -66,6 +67,17 @@ class GeoCaptchaSolver {
         this.device = device;
     }
 
+    async clearLastDigit(iframeHandler) {
+        let selector = "#captcha__audio > div.audio-captcha-input-container > input:nth-child(" + 6 + ")"
+        let lastDigit = await iframeHandler.locator(selector).inputValue()
+        if (lastDigit !== "") {
+            console.log(this.device.model() + ":last digit is not empty, clear it")
+            await iframeHandler.locator(selector).fill("")
+        } else {
+            console.log(this.device.model() + ":last digit is empty, do nothing")
+        }
+    }
+
     async solve(onResult) {
         console.log(this.device.model() + ":solve() called.")
         console.log(this.device.model() + ":play audio")
@@ -89,6 +101,9 @@ class GeoCaptchaSolver {
                         // console.log("selector is " + selector)
                         try {
                             await iframeHandler.locator(selector).focus()
+                            if (i === 5) {
+                                await this.clearLastDigit(iframeHandler)
+                            }
                             await iframeHandler.locator(selector).fill("" + number_list[i - 1])
                         } catch (e) {
                             console.log(e)
@@ -100,7 +115,7 @@ class GeoCaptchaSolver {
                         try {
 
                             let content = await captcha_container.innerHTML()
-                            console.log("inner container is " + content)
+                            console.log(this.device.model() + ":inner container is " + content)
                             try {
                                 if (number_list.length === 0) {
                                     onResult(false)
@@ -132,10 +147,10 @@ class GeoCaptchaSolver {
             let fileName = crypto.randomUUID() + ".wav";
             wget({url: audioUrl, dest: dest_dir + fileName}, async function (error, response, body) {
                 if (error) {
-                    console.log('--- error:');
+                    console.log(this.device.model() + ':--- error:');
                     console.log(error);            // error encountered
                 } else {
-                    console.log('download the file successfully');
+                    console.log(this.device.model() + ':download the file successfully');
                     //    send request to get numbers
                     await sendRequest(dest_dir + fileName, callback);
                 }
@@ -144,7 +159,7 @@ class GeoCaptchaSolver {
     }
 
     async resetBrowser() {
-        console.log("will reset browser")
+        console.log(this.device.model() + ":will reset browser")
         await this.device.shell("pm clear com.android.chrome")
         await delay(1000)
         await this.device.shell("am set-debug-app --persistent com.android.chrome")