def ascan; gets.split.map(&:to_i);end

h,m,s = gets.chomp.split
h = h.to_i
m = m.to_i
s = s[3..-1].to_f+1e-3

t = Time.utc(1, 1, 1, h, m)
t -= 9*60*60
t += s*60*60

puts t.strftime("%H:%M")