#include <iostream>
#include <cstring>
#include <fstream>
#define N 301
using namespace std;
char s[N], pmax[N];
bool ok;


void Citire()
{
    ifstream cin("date.in");
   while(cin>>s)
   {
       if(s[0]>='0'&&s[0]<='9')
       {
           if(ok==0) strcpy(pmax,s);
           else
             if(strcmp(pmax,s)<0)strcpy(pmax,s);
         ok=1;
       }
   }
   if(ok!=0)cout<<pmax;
   else cout<<"nu exista";
}

int main()
{
   Citire();
    return 0;
}