def f(y, m):
    days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    if y % 4 == 0 and (y % 100 != 0 or y % 400 == 0):
        days[1] += 1
    return days[m - 1]
y, m, d = map(int, input().split("/"))
d += 2
if d > f(y, m):
    d = d - f(y, m)
    m += 1
    if m > 12:
        m = 1
        y += 1
print("{0:04d}/{1:02d}/{2:02d}".format(y, m, d))