import sys
import math

# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.
arr = []
lon = float(raw_input().replace(",","."))
lat = float(raw_input().replace(",","."))
n = int(raw_input())
for i in xrange(n):
    arr.append(raw_input().split(";"))

for obj in arr:
    obj[4] = float(obj[4].replace(",","."))
    obj[5] = float(obj[5].replace(",","."))
aarr = []
dm = 99999999
name = ""
for obj in arr:
    x = (obj[4]-lon)*math.cos((lat+obj[5])/2)
    y = (obj[5] - lat)
    d = math.sqrt(x**2+y**2)*6371
    print >> sys.stderr,obj[1]," ",d
    if d < dm:
        name = obj[1]
        dm = d
# Write an action using print
# To debug: print >> sys.stderr, "Debug messages..."


print name