ESP-Home Lambda help, uid to decimal

ESPHome
1

Can anyone help me with replacing the random value with the decimal value of the tag read here:

rc522_spi:
  cs_pin: GPIO9
  on_tag:
      - rtttl.play:
          rtttl: !lambda |- 
                  return id(songs)[int(rand() % 26)].c_str();

I’m guessing I need to use the x value.
But the tags are for example: 6A-65-19-BC so the - needs to be removed first before doing a hex → dec.

All attempts so far has just resulted in errors.

2

!lambda 'return x;'

What are trying to do with dec?
6A-65-19-BC in dec would be 106-101-25-188. What’s the point?

3

To make sure the same tag plays the same song every time without having to hardcode every hex possible.
So by converting it to decimal and doing modulo 26 I get a song from every tag whatever the uid is.
That is also why I need to remove the -