#!/usr/bin/env python3

import sys

input_file = sys.argv[1]

hailstones = []

with open(input_file) as fd:
    for line in fd.readlines():
        line = line.rstrip()
        line.replace("@", ",")
        hailstone = [int(h) for h in line.split(",")]
        hailstones.append(hailstone)