#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
Int calc(Int x){
  Int res=0;
  // *12*
  {
    Int t=1,y=x;
    while(12<=y){
      Int z=y%100;
      if(13<=z){
        res+=(y/100+1)*t;
      }else{
        res+=(y/100)*t;
        if(12<=z) res+=x%t+1;
      }
      t*=10;
      y/=10;
    }
  }
  // *1, 2*
  {
    if(2<=x) res++;
    Int a=2,b=1,t=1;
    while(a*10+2<=x){
      res+=t;
      a=a*10+9;
      b=b*10;
      t=t*10;
    }
    if(b*20+2<=x){
      res+=(x-b*20)/10;
      if(x%10>=2) res++;
    }
  }
  return res;
}

signed main(){
  Int a,b;
  cin>>a>>b;
  Int ans=calc(b)-calc(a-1);
  string s=to_string(a);
  if(s.front()=='2'&&s.back()=='2') ans--;
  cout<<ans<<endl;
  return 0;
}