inputs = gets.split('/')
y = inputs[0].to_i # year
m = inputs[1].to_i # month
d = inputs[2].to_i # date

def last_date_of(year, month)
  thirty_days_month = [4, 6, 9, 11]
  thirtyone_days_month = [1, 3, 5, 7, 8, 10, 12]

  if thirty_days_month.include?(month)
    30
  elsif thirtyone_days_month.include?(month)
    31
  elsif year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)
    29
  else
    28
  end
end

after = 2 # 何日後の日付を答えとするか
last_date = last_date_of(y, m)
is_overflow = d + after > last_date

if is_overflow
  if m == 12
    # 12月で月が変わる場合
    ans_y = y + 1
    ans_m = 1
  else
    ans_y = y
    ans_m = m + 1
  end
  ans_d = d + after - last_date
else
  ans_y = y
  ans_m = m
  ans_d = d + after
end

answer = "#{ans_y.to_s.rjust(4, '0')}/#{ans_m.to_s.rjust(2, '0')}/#{ans_d.to_s.rjust(2, '0')}" 
puts answer