20

inp = input()
yearsales = {}
with open("wands.csv", "r", encode="utf") as infile:
    for n, line in enumerate(infile, 1):
        line = line.rstrip('\n')
        tempsplit = line.split(';')

        if tempsplit[0] == inp:
            if (yearsales.get(year)):
                yearsales[year] += 1
            else:
                yearsales[year] = 1

maxk, maxv = 0
for k, v in yearsales.items():
    if v > maxv:
        maxv = v
        maxk = k
print(maxk)