import sys
import fileinput
import time
import re
import math

def convertDegrees(degrees):
    return '%02.0f'%math.modf(degrees)[1]+'%06.3f'%(math.modf(degrees)[0]*60)

lat=lon=0
count=0

for line in sys.stdin:
    strlat, strlon = line.split(",")
    lat+=float(strlat)
    lon+=float(strlon)
    count+=1

lat/=count
lon/=count

sentence="$GPGGA,"+time.strftime("%H%M%S", time.gmtime())+","+convertDegrees(lat)+"N,"+convertDegrees(lon)+"E,1,04,50,0,M,0,M,,*0"
print sentence