It seems many people don’t know that we can pass a list of characters as 2nd argument of String.split/2.
It is pretty useful when parsing your input.
Think about it in the coming days. 
iex(1)> line = "Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53"
"Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53"
iex(2)> ["Card " <> id, winning, mine] = String.split(line, [":", "|"])
["Card 1", " 41 48 83 86 17 ", " 83 86 6 31 17 9 48 53"]
iex(3)> winning = String.split(winning)
["41", "48", "83", "86", "17"]
iex(4)> mine = String.split(mine)
["83", "86", "6", "31", "17", "9", "48", "53"]
iex(5)> id
"1"
