#!python
# -*- coding: utf-8 -*-


def is_uruu(y):
    if y % 4 == 0:
        if y % 100 == 0:
            if y % 400 == 0:
                return True
            return False
        return True
    return False


def main():
    Y, M, D = map(int, input().split('/'))

    m = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    if is_uruu(Y):
        m[1] = 29

    D += 2
    if D > m[M - 1]:
        D = D % m[M - 1]
        M += 1

    if M > 12:
        Y += 1
        M %= 12

    print('{y:0>4}/{m:0>2}/{d:0>2}'.format(y=Y, m=M, d=D))


if __name__ == '__main__':
    main()