#include <bits/stdc++.h>
using namespace std;
#define ld long double
#define ll long long
#define task "mins"
vector <string> v;
string s;
string mini,tam;
inline bool cmp(string a, string b)
{
if(a.size()!=b.size()) return a.size()>b.size();
return a>b;
}
inline void sosanh(string a)
{
if(mini=="") mini=a;
else
if(cmp(mini,a)) mini=a;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
if(fopen(task ".inp", "r"))
{
freopen(task ".inp", "r", stdin);
freopen(task ".out", "w", stdout);
}
cin >> s;
s+='#';
for(auto c:s)
{
if(isdigit(c))
{
if(c=='0'&&tam!="") tam.push_back(c);
else if(c!='0') tam.push_back(c);
}
else
{
if(tam.back()%2!=0) sosanh(tam);
tam="";
}
}
if(mini=="") cout << "NONE";
else cout << mini;
return 0;
}
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