CodinGame_2023_09_14__16_17_48__team_set.rb

allKids = gets.chomp
numOfTeams = gets.to_i
kids = allKids.split(', ')

numOfTeams.times do |i|
  r = "Team #{i + 1}: "
  (i...kids.length).step(numOfTeams) do |j|
    r += "#{kids[j]}, "
  end
  r = r[0...-2]
  puts r
end