#include<bits/stdc++.h>
using namespace std;
int main(){
    string s,tmp;
    cin>>s;
    istringstream t(s);
    vector<int> a;
    while(getline(t,tmp,'/')){
        a.emplace_back(stoi(tmp));
    }
    bool leap=false;
    if((a[0]%400==0)||(a[0]%100!=0&&a[0]%4==0))leap=true;
    vector<vector<int>> day={
        {31,28,31,30,31,30,31,31,30,31,30,31},
        {31,29,31,30,31,30,31,31,30,31,30,31}
    };
    a[2]+=2;
    if(a[2]>day[leap][a[1]-1]){
        a[2]-=day[leap][a[1]-1];
        a[1]+=1;
    }
    if(a[1]>12){
        a[1]-=12;
        a[0]+=1;
    }
    ostringstream ans;
    ans<<a[0]<<'/'<<setw(2)<<setfill('0')<<a[1]<<'/'<<setw(2)<<a[2];
    cout<<ans.str()<<endl;
}