def uru(year):
    if (year % 4 == 0):
        if (year % 100 == 0):
            if (year % 400 == 0):
                return True
            else:
                return False
        else:
            return True
    else:
        return False

s = input()
ymd = s.split('/')
year = int(ymd[0])
month = int(ymd[1])
day = int(ymd[2])

day_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
day = day + 2

if (month == 2):
    if (uru(year)):
        if (day > day_in_month[2-1]+1):
            day = day - (day_in_month[month-1]+1)
            month += 1
    else:
        if (day > day_in_month[2-1]):
            day = day - day_in_month[month-1]
            month += 1
else:
    if (day > day_in_month[month-1]):
        day = day - day_in_month[month-1]
        month += 1
        if (month > 12):
            month = 1
            year += 1

print(str(year) + '/' + str(month).zfill(2) + '/' + str(day).zfill(2))