RSA Encryption with unknown format

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Mobile

Android

RSA

What can be achieved to this encrypted format?

My android app send encrypted messages to the c# server but server want encrypted messages actually like this unknown formatchinese words.

筊맲躥慢૬䣍毤_箬첑�沆ň䇷㨡鬩

But android encrypt messages like this format (on7vQhgNeVDVDu4evL0HZ5UbC2C1oZdamfU9XBLGZQZ13MLQKu2speIWNaldsfcGfPS)

I use RSA algorithm with same public/private keys in c sharp and android. where am i interrupted?

Something wrong with this approach with this unknown format.

Its seems android have problem with class of encryption I don't know what else need to use for this issue

Thank you for advice

Android code

public class MainActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.acti);
    try {
        generateKey();
    } catch (Exception e1) {
        e1.printStackTrace();
    }
}

public  static void generateKey() throws Exception {



    String modulusString = 
"tx94IV9NAutFU1HQjXmkLzknJ5vatO
FyhD90Un3u5oiOc4
e9fT1bsM0af3OqNMCTRLPuQJ2JQokY+3T0icJqHgG/aHvbmvDvRKn2QrVxAFt8EN6
jp/S6+dRe1B/6eJbVRJJpeekLslqGqdQgr+5ocD+ZPjiE2iL6sGGyAYz+lOJtSr9N4ZcD
4kNikI3J9kZDNO78rEqQuX7flh0RS79N63MJ9xX9fBuqHFIud3KKKbqHiA
SQoaU1rWqZ2VIdqfXzreZMYHpHYioVzyrbk
/wdQQV2ibmJFAsa5aiKSP+g9rF4xYoPAistePDwn4O
+wARGlMsu7RYVAIeUM77l+w6ugw==";
    String ExponentString = "AQAB";
    byte[] modulusBytes = Base64.decode(modulusString.getBytes("UTF-8"), Base64.DEFAULT);
    byte[] exponentBytes = Base64.decode(ExponentString.getBytes("UTF-8"),Base64.DEFAULT);
    BigInteger modulus = new BigInteger(1, modulusBytes);
    BigInteger publicExponent = new BigInteger(1, exponentBytes);


    KeyFactory fact = KeyFactory.getInstance("RSA");
    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
    String INPUT = "GAVDOOL";

    RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, publicExponent);
    PublicKey pubKey = fact.generatePublic(rsaPubKey);
    cipher.init(Cipher.ENCRYPT_MODE, pubKey);

  //  byte[] plainBytes = clearTextPassword.getBytes();
    byte[] cipherData = cipher.doFinal(INPUT.getBytes());
    String encryptedStringBase64 = Base64.encodeToString(cipherData, Base64.DEFAULT);
    System.out.println("Encrypted?????"+encryptedStringBase64);
    System.out.println(encryptedStringBase64.length());

          }
           }