/* -*- coding: utf-8 -*-
 *
 * 721.cc: No.721 Die tertia (ディエ・テルツィア) - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int doms[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

/* typedef */

/* global variables */

int readnum(string &s, int i, int l) {
  int num = 0;
  while (l--) num = num * 10 + s[i++] - '0';
  return num;
}

/* subroutines */

inline bool leap(int y) {
  return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);
}

inline int dom(int y, int m) {
  return (leap(y) && m == 2) ? 29 : doms[m];
}

/* main */

int main() {
  string ymd;
  cin >> ymd;

  int y = readnum(ymd, 0, 4);
  int m = readnum(ymd, 5, 2);
  int d = readnum(ymd, 8, 2);
  //printf("%d/%d/%d\n", y, m, d);

  int dm = dom(y, m);
  d += 2;
  if (d > dm) m++, d -= dm;
  if (m > 12) m = 1, y++;

  printf("%04d/%02d/%02d\n", y, m, d);
  return 0;
}