problema 2288

#include <iostream>
using namespace std;
int main()
{
    int n,m=0;
    cin>>n;
    while (n!=0){
        if ((n%10>m) and (n%10%2==1))
            m=n%10;
        n=n/10;
    }
if (m==0)
    cout<<"nu exista";
else
    cout<<m;
return 0;
}