#include<bits/stdc++.h> using namespace std; bool check(int x) { int sum1=0,sum2=0,p=1; while(x) { if(p) sum1+=x%10; else sum2+=x%10; p^=1; x/=10; } return sum1==sum2; } int main() { int a,b,ans=0; cin>>a>>b; for(int i=a;i<=b;i++) { if(check(i)) ans++; } cout<<ans; return 0; }