in LUA, write a program that takes a file with an input htat looks like this

julia@534@4
julia@345@2
pedro@754@2
pedro@234@2
pedro@234@1
jack@234@2
jack@234@1
julia@555@2

then, searches for an id (the 3th colum separating by @), and orderes by the second column. if someone is two times in the same id, take the highest value