#include <iostream>
using namespace std;
 
int count_six(int input){
	int rez = 0, mem = 1, length = 0, exp_10 = 1;
	short num;
	while(input > 0){
		num = input % 10;
		input /= 10;
		if(num < 6) rez += num * exp_10 * length;
		if(num == 6) rez += num * exp_10 * length + mem;
		if(num > 6) rez += num * exp_10 * length + exp_10 * (length == 0? 1 : 10);
		if(length != 0) exp_10 *= 10;
		mem += num * exp_10;
		length++;
	}
	return rez;
}
 
int main() {
	int a, b;
	cin >> a >> b;
	if (a > b) swap(a, b);
	cout << count_six(b) - count_six(a - 1);
	return 0;
}

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