#include<bits/stdc++.h>
using namespace std;
bool ok(long long x){
string s = to_string(x);
int n = s.size();
for(int i = 0; i < n - 2; i++){
if(s[i] == s[i + 1] or s[i] == s[i + 2])
return false;
}
return true;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
long long a, b, ans = 0;
cin >> a >> b;
for(long long i = a; i <= b; i++){
ans += ok(i);
}
printf("%lld", ans);
}
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