A, B, S = gets.chomp.split

time = Time.new(2021, 1, 1, A.to_i, B.to_i)

if S[3] == '+'
  offset = S[4..-1].to_f - 9
  time += offset * 3600
else
  offset = 9 + S[4..-1].to_f
  time -= offset * 3600
end

puts "%02d:%02d" % [time.hour, time.min]