from csv import *
from math import hypot

def distance(L1,L2):
    return hypot(L1[0]-L2[0],L1[1]-L2[1])

point_mystère = (320,240)

table = []

with open('prairie.csv','r') as fichier:
    lignes = reader(fichier,delimiter=' ')
    for ligne in lignes:
        (x,y) = (int(ligne[0]),int(ligne[1]))
        couleur = ligne[2]
        table.append((distance(point_mystère,(x,y)),couleur))

def neighbours(couple):
    return couple[0]

table.sort(key=neighbours)

print([table[k][1] for k in range(3)])