how to send special characters in expect script?

I'm trying to send special characters (password) which contains #?!k;|C . these password is dynamic and cannot be hardcoded in script. so I'm passing through variable as below

$ expect ./passwordlessSSH.exp $hostname "$password"

the code of this script is as below

#!/usr/bin/expect -f
 set host [lindex $argv 0]
set pass [lindex $argv 1]

spawn ssh-copy-id -i /home/hdpsvcs/.ssh/id_rsa.pub hdpsvcs@$host
expect {
  "yes" {
    send "yes\r"
  }
    "assword" {
    send "$pass \r"
}
exit 0

But still it is not running the script properly. I don't see any error but pass variable is not sent properly. PLease help me

Output is as below

$ expect ./passwordlessSSH.exp $hostname "$password"

 spawn ssh-copy-id -i /home/hdpsvcs/.ssh/id_rsa.pub test@otesthost
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed:
"/home/test/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are     prompted now it is to install the new keys
\S
Kernel \r on an \m
test@test's password: 
$