Integrated counter for words and characters

I've been thinking of developing some contests for Steemit newcomers in order to incentivize the expansion of the community. But, to do these activities, it's necessary to have a counter for words and characters as some other platforms have.

Counters are great to have control over the content people are writing, because it provides a guide in the extension of the written structure.

For example, the following image, found over the internet describes what I mean.