Moria Doors

Simple

Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a toatl mses and you can sitll raed it wouthit porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.
-- Unknown Author.

"Ennyn Durin Aran Moria. Pedo mellon a Minno. Im Narvi hain echant. Celebrimbor o Eregion tethant. I thiw hin"
"The Doors of Durin, Lord of Moria. Speak friend and enter. I Narvi made them. Celebrimbor of Hollin drew these signs."
-- "The Fellowship of the Ring" J. R. Tolkien

The Doors of Durin were opened by Gandalf and the Fellowship entered in Moria . As they found, this underground kingdom has gates on every passageway. Each gate has a written message which contains the key word. Luckily, Gimli knows how to recognize the key in these messages. It's the most "like" word, which has the greatest average "likeness" coefficient with other words in the message.

You are given a message. You need to pick out all words (a letter or group of letters that has meaning when spoken or written and typically shown with a space or other punctuation sign on either side when written or printed), calculate the "likeness" coefficients with other words, take an average of them and choose the greatest. Count "likeness" coefficient even for the same words (of course it's 100). If several words have the same resulting...

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