import csv
import numpy as np
import matplotlib.pyplot as plt
tab=[]
tab2=[]
tempTab=[]
miasto=input("Podaj lotnisko: ")
while miasto!="poznan" and miasto!="warszawa":
    miasto=input("Podaj lotnisko ponownie: ")
if (miasto=='poznan'):
    print("Otwieram dane lotniska Poznan")
    with open('zad2.txt','r',newline='') as f:
        oldYear = f.readline().split(',')[1].split('-')[0]
        f.seek(0)
        d = csv.reader(f,delimiter=',')
        for i in d:
            currentYear = i[1].split('-')[0]
            if oldYear != currentYear:
                oldYear = currentYear
                tab.append(tempTab[:])
                del tempTab[:]
            tempTab.append([float(i[2]), float(i[3])])
            tab2.append([str(i[0]), str(i[1]), float(i[2]), float(i[3])])
tab4=np.array(tab[0])
tab3=np.array(tab2)
a=max(tab[0])
b=min(tab[0])



if tab4[0][0] >= tab4[0][1]:
    print(tab4[0][0])
else:
    print(tab4[0][1])