lon = float(input().replace(',', '.'))
lat = float(input().replace(',', '.'))
n = int(input())
for i in range(n):
    defib = input()
    dane = defib.split(";")
    lon_d = float(dane[4].replace(',', '.'))
    lat_d = float(dane[5].replace(',', '.'))
    x = (lon_d - lon)*math.cos((lat + lat_d) / 2)
    y = lat_d - lat
    d = math.sqrt(x**2 + y**2) * 6371
# 4- lon
#5- lat
    print(d, file=sys.stderr)