### Problem 71a. Biggest three vectors.

Given an array a[0] .. a[n-1] of vectors, each vector
being a k-tuple of the form

v = (c_1, c_2, c_3, ... , c_k)

where each c_j is a double. The **norm** of this vector is
defined as

|v| = sqrt{ (c_1)^2 + (c_2)^2 + (c_3)^2 + ... + (c_k)^2 }.

From among the given vectors a[0] to a[n-1], find the
vectors a[k] and positions k of the three vectors with the
biggest norm values, and show these three
vectors arranged from highest norm to lowest norm.

**Input**. The values of n and k on the first line,
followed by the vectors themselves, one per line. For example:

6 3
1.5 -2.1 4.7
1.2 2.0 5.1
6.1 2.3 -1.5
2.0 -2.3 6.2
0.23 3.5 4.3
3.4 1.4 2.1

**Output**. As described above.