#include<cstdio>
#include<sstream>
#include<cstdlib>
#include<cctype>
#include<cmath>
#include<algorithm>
#include<set>
#include<queue>
#include<stack>
#include<list>
#include<iostream>
#include<fstream>
#include<numeric>
#include<string>
#include<vector>
#include<cstring>
#include<map>
#include<iterator>

using namespace std;
std::map<long long, long long> smap;

void create(long  org, long  mult, int pos){
    if(pos == 10)
        return;
    long  res = org*10 + mult;
    smap[pos] = res;
    create(res, mult*10, pos+1);
}

long pass(int n){
    string str = to_string(n);
    ll sum = 0;
    for(int i = 0; i<str.size(); i++){
        int org = str[i]-48;
        unsigned long si = str.size()-i-1;
        int temp = (org*(org-1))/2;
        if(org>0){
            sum += (org*smap[si]) + (temp*pow(10, si)) + org;
            string sub = str.substr(i+1);
            if(sub.size()){
                ll te = stoll(sub);
                sum += te*org;
            }
        }
    }
    return sum;
}

class SumThemAll {
public:
    long long getSum(int lowerBound, int upperBound){
        create(0,45,1);
        return (pass(upperBound) - pass(lowerBound-1 < 0 ? 0 : lowerBound-1));
    }
};