Read the below sentence carefully...
"I do not know where family doctors acquired illegibly perplexing
handwriting nevertheless, extraordinary pharmaceutical intellectuality
counterbalancing indecipherability,transcendentalizes
intercommunications'
incomprehensibleness".
In this sentence the Nth word is N letters long. e.g. 3rd word is 3
letters long, 8th word is 8 letters long and so on.