#include <bits/stdc++.h>
using namespace std;

int main() {
    string s;
    cin >> s;
    int year = stoi(s.substr(0, 4));
    int month = stoi(s.substr(5, 2));
    int day = stoi(s.substr(8, 2));

    bool leap = false;

    if(year % 4 == 0) {
        if(year % 100 == 0) {
            if(year % 400 == 0) {
                leap = true;
            }
        }
        else leap = true;
    }

    vector<int> days = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    if(leap) days[1]++;

    day += 2;
    if(day > days[month-1]) {
        day -= days[month-1];
        month++;
    }
    if(month == 13) {
        month = 1;
        year++;
    }

    cout << year << '/' << setw(2) << setfill('0') << month << '/' << setw(2) << setfill('0') << day << '\n';

    return 0;
}