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Learning Opportunities

This puzzle can be solved using the following concepts. Practice using these concepts and improve your skills.

Statement

 Goal

You have to convert an English length unit into another one.
You are given the relations needed to calculate some unit into some other unit.

Note: You might know that 1 nautic mile = 6080 foot and not 6000 foot. For the purpose of this puzzle, we removed this contradiction.
Input
Line 1: unit 1 in unit 2
Line 2: The number n of relations below
Next n lines: number unit x = number unit y
Output
number unit 1 = number unit 2
Constraints
The numbers in the relations are integers, not always ones on the left, the smallest numbers possible.
Example
Input
inch in twip
3
1 point = 20 twip
1 inch = 12 line
1 line = 6 point
Output
1 inch = 1440 twip

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