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Time Limit: 1.0 Seconds Memory Limit: 65536K

Total Runs: 1137 Accepted Runs: 500

The military academy often employs some of their agents to keep their eyes on the susceptible areas.
Suppose **MN** is the barracks for the soldiers and **B**, **C** are two blocks within it.
The commander sent two soldiers from block **B** and **C** destined to the location A.
The two soldiers were going to their destination on the direction of **BA** and **CA** respectively.
Both of them were inspecting the areas on their left and right.
But when they were reached exactly on the halfway to their destination **A**,
both of them were sent back to the barracks for an emergency need.
So, both the soldiers returned to the pavilion on the shortest paths.
They made an area of common observation **EFPQ** i.e. watched by both the soldiers.
You have to calculate the side of the common observation area **EFQP**, if it can be recognized as a square.

You are given the triangular area of **AEF**.
You should keep it in mind that the common area **EFQP** will not be necessarily become a square always but you
can treat this area as an equivalent of a square. **E** and **F** are the mid points of **AB** and **AC** respectively. Each input will be given in a single line. Input is terminated by a negative number.

You have to calculate the side of the square that is equivalent to the area **EFQP**. The output should be correct to two decimal places.

100 653 2099 -1

14.14 36.14 64.79

*Problem Setter: Samina Azad (CSE - 03)*

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