#include <iostream>
using namespace std;
/*
Pasii de implementare:
Declarăm și citim variabilele “a” si “c”.
Declaram variabila “noOfOne” initializata cu valoarea zero.
 
Cu o structura repetitiva de tip “for” 
care va itera de la “a” pana la “c” inclusiv:
	Declaram variabila “temp” 
	initializata cu valoarea variabilei care va face iteratia.
	Cu o structura repetitiva “while” 
	a carei condiție de rulare verifica ca “temp” sa fie diferit de “0”:
		Cu o structura decizionala care verifica ca 
		ultima cifra a lui “temp” este egala cu “1”:
			Incrementam variabila “noOfOne”.
	 J. Taiem ultima cifra a lui “temp”.
Afisam “noOfOne”.
*/
 
const int TEN = 10;
 
int main() {
	int a, c;
	cin >> a >> c;
	int noOfOne = 0;
	while (a <= c) {
		int temp = a;
		while (temp) {
			if (temp % TEN == 1) {
				++noOfOne;
			}
			temp /= TEN;
		}
		++a;
	}
	cout << noOfOne;
	return 0;
}

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