#include <bits/stdc++.h>
using namespace std;
#define all(c) (c).begin(),(c).end()
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--)
#define REP(i,m,n) for(int i=(int)(m);i<(int)(n);i++)
#define rep(i,n) REP(i,0,n)
#define iter(c) __typeof((c).begin())
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
#define mem(a) memset(a,0,sizeof(a))
#define pd(a) printf("%.10f\n",a)
#define pb(a) push_back(a)
#define in(a) insert(a)
#define pi M_PI
#define R cin>>
#define F first
#define S second
#define C class
#define ll long long
#define ln cout<<'\n'
#define _(_1,_2,_3,N,...)N
#define pr(...) _(__VA_ARGS__,pr3,pr2,pr1)(__VA_ARGS__)
template<C T>void pr1(T a){cout<<a;ln;}
template<C T,C T2>void pr2(T a,T2 b){cout<<a<<' '<<b;ln;}
template<C T,C T2,C T3>void pr3(T a,T2 b,T3 c){cout<<a<<' '<<b<<' '<<c;ln;}
template<C T>void PR(T a,int n){rep(i,n){if(i)cout<<' ';cout<<a[i];}ln;}
bool check(int n,int m,int x,int y){return x>=0&&x<n&&y>=0&&y<m;}
const ll MAX=1000000007,MAXL=1LL<<60,dx[4]={-1,0,1,0},dy[4]={0,1,0,-1};
typedef pair<int,int> P;

ll calc(ll a) {
  ll ans=0,d=13,c=1;
  rep(i,15) {
    ll x=max(0LL,a-d-1);
    ans+=ceil((double)x/(c*100))*c;
    if(a/c%100==12) ans+=a%c+1;
    if((a/c%100==13||a/c%100==14)&&a%c==0) ans+=c;
    d*=10;
    c*=10;
    if(c==1||c>a) continue;
    else if(a>c*10) ans+=c/10;
    else {
      stringstream ss;
      string s;
      ss << a;
      ss >> s;
      if(s[0]<='1') continue;
      else if(s[0]>='3') ans+=c/10;
      else {
        stringstream ss2;
        ss2 << s.substr(1);
        ss2 >> x;
        x/=10;
        if(a%10>=2) x++;
        ans+=x;
      }
    }
  }
  return ans;
}

void Main() {
  ll a,b;
  cin >> a >> b;
  int k=0;
  if(a==b) {
    string s;
    stringstream ss;
    ss << a;
    ss >> s;
    int cnt=0;
    rep(i,s.size()-1) {
      if(s[i]=='1'&&s[i+1]=='2') cnt++;
    }
    pr(cnt);
    return;
  } else if(a==1&&b>=2) k++;
  pr(calc(b)-calc(a-1)+k);
}

int main() {
  ios::sync_with_stdio(0);cin.tie(0);
  Main();return 0;
}