S = gets.chomp
a,b,g = [S[0,2].to_i, S[3,2].to_i, S[9 ... S.size].to_f]
t0 = a * 60 + b - 9 * 60
h,m = (t0 + (60 * g).round).divmod(60)

puts [h % 24, m].map{|hm| '%02d' % hm  }.join(':')