diff --git a/03-rozwiazanie.js b/03-rozwiazanie.js
index be5bc10..26f800f 100644
--- a/03-rozwiazanie.js
+++ b/03-rozwiazanie.js
@@ -7,12 +7,12 @@ switch (flag) {
         break;
     case '-d':
         let fcs = JSON.parse(process.argv[4].replace(/'/g, '"'));
-
         console.log(crc.decode(message, fcs));
         break;
     case '-t':
-
-
+        let res = crc.encode(message);
+        console.log(res.encoded);
+        console.log(crc.decode(message, res.FCS))
         break;
     default:
         throw "incorect flag"