+++CifraImparaMaxima

#include <iostream>
using namespace std;

int main()
{
    int n, c, max=0;
    bool ok=0;
    cin>>n;
    while(n!=0)
    {
        c=n%10;
        if(c%2==1)
        {
            if(c>max)
                max=c;
            ok=1;
        }
        n=n/10;
    }
    if(ok==1)
        cout<<max;
    else
        cout<<"nu exista";
    return 0;
}