#include<bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define pb push_back
#define all(v) v.begin(), v.end()
#define sz(x) (long long)(x.size())
using namespace std;
ll a, b, maxn, t[30], dp[30][3];
ll calc( ll vt, ll x, ll y, bool c )
{
if(vt == 0)
return dp[vt][c] = 1;
if(dp[vt][c] != -1) return dp[vt][c];
ll ans = 0;
for( int w = (vt == maxn ? 1 : 0); w <= (c ? t[vt] : 9); w ++ )
{
if(w == y || w == x) continue;
ans += calc(vt - 1, y, w, c & (w == t[vt]));
}
return dp[vt][c] = ans;
}
ll solve( ll k )
{
memset(dp, -1, sizeof(dp));
string s;
while(k)
{
s = s + char(k % 10 + 48);
k /= 10;
}
for( int w = 0; w < sz(s); w ++ )
{
t[w + 1] = s[w] - 48;
maxn = w + 1;
}
return calc( maxn, -1, -1, 1 );
}
int main()
{
cin.tie(0)->sync_with_stdio(0);
cin >> a >> b;
if( a == 0 )
{
cout << solve(b);
return 0;
}
cout << solve(b) - solve(a - 1);
return 0;
}
