#include <iostream>

using namespace std;

int main()
{
    int a,b,n,c,i,k;

    cin>>a;
    cin>>b;

    k=0;

    for(i=a;i<=b;i++)
    {
        n=i;
        c=0;
        while(n>0)
        {
            if(n%2==1)
                c=c+1;
            n=n/10;
        }
        if(c>0)
            k=k+1;
    }
    cout<<k;
    return 0;
}