#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<long double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-6;
const ll mod=1e9+7;
const int dx[4]={0,1,0,-1},dy[4]={1,0,-1,0};

const int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};

int Y,M,D;
char c;

void f(){
	D++;
	int t=a[M],B=0;
	if(Y%4==0) B=1;
	if(Y%100==0&&Y%400!=0) B=0;
	if(M==2) t+=B;
	if(D>t){
		D=1;
		M++;
		if(M==13){
			M=1;
			Y++;
		}
	}
}

int main(){
	cin>>Y>>c>>M>>c>>D;
	f();f();
	cout<<Y<<'/';
	if(M<10) cout<<0;
	cout<<M<<'/';
	if(D<10) cout<<0;
	cout<<D<<endl;
}