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SICT1006 - Зай

A(x1,y1), B(x2,y2) цэгүүдийн хоорондох зайг ол.

Input

x1,y1, x2,y2 бодит тоонууд (double) хоосон зайгаар тусгаарлагдан нэг мөрөнд өгөгдөнө. 

Output

Зайг таслалаас хойш 8 орны ( %.8lf ) нарийвчлалтай гаргана уу.

Example

Input:
3 5 7 9

Output:
5.65685425

Added by:B@TJ@RG@L
Date:2014-02-18
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:C C++ 4.3.2 PYTHON

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