/**
	author:  shobonvip
	created: 2024.11.11 09:11:25
**/

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

//* ATCODER
#include<atcoder/all>
using namespace atcoder;
typedef modint998244353 mint;
//*/

/* BOOST MULTIPRECISION
#include<boost/multiprecision/cpp_int.hpp>
using namespace boost::multiprecision;
//*/

typedef long long ll;

#define rep(i, s, n) for (int i = (int)(s); i < (int)(n); i++)
#define rrep(i, s, n) for (int i = (int)(n)-1; i >= (int)(s); i--)
#define all(v) v.begin(), v.end()

template <typename T> bool chmin(T &a, const T &b) {
	if (a <= b) return false;
	a = b;
	return true;
}

template <typename T> bool chmax(T &a, const T &b) {
	if (a >= b) return false;
	a = b;
	return true;
}

template <typename T> T max(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmax(ret, a[i]);
	return ret;
}

template <typename T> T min(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmin(ret, a[i]);
	return ret;
}

template <typename T> T sum(vector<T> &a){
	T ret = 0;
	for (int i=0; i<(int)a.size(); i++) ret += a[i];
	return ret;
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	
	string s; cin >> s;
	int y = 0, m = 0, d = 0;
	rep(i,0,4) {
		y *= 10;
		y += s[i] - '0';
	}
	rep(i,5,7) {
		m *= 10;
		m += s[i] - '0';
	}
	rep(i,8,10) {
		d *= 10;
		d += s[i] - '0';
	}

	int uru = 0;
	if (y % 400 == 0) {
		uru = 1;
	}else if (y % 100 == 0) {
		uru = 0;
	}else if (y % 4 == 0) {
		uru = 1;
	}else{
		uru = 0;
	}


	vector<int> days = {31, 28 + uru, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

	d += 1;
	if (d > days[m - 1]) {
		d = 1;
		m += 1;
		if (m > 12) {
			m = 1;
			y += 1;
		}
	}

	d += 1;
	if (d > days[m - 1]) {
		d = 1;
		m += 1;
		if (m > 12) {
			m = 1;
			y += 1;
		}
	}

	string ans = "";
	rep(i,0,2) {
		ans += char(d % 10 + '0');
		d /= 10;
	}
	ans += '/';
	rep(i,0,2) {
		ans += char(m % 10 + '0');
		m /= 10;
	}
	ans += '/';
	rep(i,0,4) {
		ans += char(y % 10 + '0');
		y /= 10;
	}
	reverse(all(ans));
	cout << ans << '\n';

}