#include<bits/stdc++.h> using namespace std; int main() { int a,b,sum=0,k,os=0,js=0,ws=1; cin>>a>>b; for(int i=a; i<=b; i++) { k=i; while(k>0) { if(ws%2==0) os+=k%10; else js+=k%10; k/=10; ws++; } if(js==os) { sum++; } os=0; js=0; ws=1; } cout<<sum; return 0; }