The Einstein Problem-Lite The Einstein Problem-Lite
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The Einstein's Puzzle is a well-known logic puzzle. It is often called Einstein's Puzzle because it is said to have been invented by Albert Einstein as a boy. However, there is no known evidence for Einstein's or Carroll's authorship. This puzzle can be modified with various conditions to produce a variety of similar puzzles. For starters, we will solve a simplified version of the puzzle.

There are 5 houses on street which are painted 5 different colors: blue, green, red, white and yellow.
In each house lives a person of a different nationality: Brit, Dane, German, Norwegian and Swede.
These people drink a certain beverage: beer, coffee, milk, tea and water.
Smoke a certain brand of cigarettes: Rothmans, Dunhill, PallMall, Winfield and Marlboro.
They keep a certain pet: cat, bird, dog, fish and horse.

None of the owners have the same pet, smoke the same brand of cigarette, or drink the same beverage.

You are given a set of "relations". Each relation connects two identifiers in the owner relationships. For example: "Norwegian-Dunhill" indicates that the Norwegian smokes only Dunhill. "5-dog" indicates that the owner of the 5th house also owns a dog. Similar to Einstein's version of the problem, we will use only these types of relations.

The second argument is a question which you need to answer. The question is represented as two words separated by dash. The first word is a characteristic of the owner while the second is a characteristic (number, color,nationality, beverage, cigarettes or pet) you need to determine based on the first characteristic. For example: "horse-cigarettes" asks"What the cigarettes do the owner of the horse smoke?" or "green-number" asks "What is the street number of the green house?".

Input: Two arguments. Relations as a tuple of strings and a question as a string.

Output: The answer as a string.

How it is used: This mission teaches you something about constraint satisfaction problems within the classic context of an Einstein riddle.

Precondition:
All questions have only one possible answer.