#include <bits/stdc++.h>
using namespace std;
#define ll long long
ll p[20];
ll f(ll n)
{
if (n<=9)
return n+1;
stringstream ss;
string s;
ss << n;
ss >> s;
ll len=s.length();
ll ans=10+81*(p[len-2]-1)/7+(s[0]-'1')*9*p[len-2]+(s[1]-'0'-(s[0]<s[1]))*p[len-2];
if (s[0]==s[1])
return ans;
for (ll i=2; i<len; i++)
{
ans+=max(0, s[i]-'0'-(s[i-1]<s[i])-(s[i-2]<s[i]))*p[len-i-1];
if (s[i-1]==s[i] || s[i-2]==s[i])
return ans;
}
return ans+1;
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
p[0]=1;
for (ll i=1; i<20; i++)
p[i]=p[i-1]*8;
ll a, b;
cin >> a >> b;
cout << f(b)-f(a-1);
return 0;
}
