CSES - Shared codeLink to this code: https://cses.fi/paste/36f9c1e1bd402e3f84cf97/
// हर हर महादेव
#include <bits/stdc++.h>
#define int long long int
using namespace std;

const int inf = 1e18;

int64_t power(int64_t x, int64_t y){
	int64_t res = 1;
	if (x == 0) return 0;
	while (y > 0){
		if (y & 1)
			res = (res*x);
		y = y >> 1;
		x = (x*x);
	}
	return res;
}

map<string,int> mp;
int get(string s){
	
	if(mp.find(s) != mp.end()){
		return mp[s];
	}
	
	int n = s.size();
	
	int &ans = mp[s];
	
	bool ok = true;
	
	for(int i = 0; i < n; i++){
		
		for(int j = (i == 0); j < s[i] - '0'; j++){
			if(i == 0 || s[i-1] != j + '0'){
				ans += power(9,n-i-1);
			}
		}
		
		if(i != 0 && s[i] == s[i-1]){
			ok = false;
			break;
		}
	}
	
	ans += ok;
	
	if(n > 1){
		ans += get(string(n-1,'9'));
	}
	
	return ans;
}

int get(int x){
	if(x <= 0){
		return 0;
	}
	return get(to_string(x));
}

int32_t main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	
	int a,b;
	cin >> a >> b;
	
	cout << get(b) - get(a-1) + (a == 0);
	
	return 0;
}