#include<bits/stdc++.h>
using namespace std;
#define ALL(x) begin(x),end(x)
#define rep(i,n) for(int i=0;i<(n);i++)
#define debug(v) cout<<#v<<":";for(auto x:v){cout<<x<<' ';}cout<<endl;
#define mod 1000000007
using ll=long long;
const int INF=1000000000;
const ll LINF=1001002003004005006ll;
int dx[]={1,0,-1,0},dy[]={0,1,0,-1};
// ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
template<class T>bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>bool chmin(T &a,const T &b){if(b<a){a=b;return true;}return false;}

struct IOSetup{
    IOSetup(){
        cin.tie(0);
        ios::sync_with_stdio(0);
        cout<<fixed<<setprecision(12);
    }
} iosetup;
 
template<typename T>
ostream &operator<<(ostream &os,const vector<T>&v){
    for(int i=0;i<(int)v.size();i++) os<<v[i]<<(i+1==(int)v.size()?"":" ");
    return os;
}
template<typename T>
istream &operator>>(istream &is,vector<T>&v){
    for(T &x:v)is>>x;
    return is;
}

vector<ll> p10{
    1ll,
    10ll,
    100ll,
    1000ll,
    10000ll,
    100000ll,
    1000000ll,
    10000000ll,
    100000000ll,
    1000000000ll,
    10000000000ll,
    100000000000ll,
    1000000000000ll,
    10000000000000ll,
    100000000000000ll,
    1000000000000000ll
};


// x, x+1
bool len(ll x){
    string s=to_string(x);
    string t=to_string(x+1);
    if(s.back()=='1' and t[0]=='2') return true;
    return false;
}

pair<ll,ll> naive(int n){
    ll a=0,b=0;
    for(int i=1;i<=n;i++){
        string s=to_string(i);
        for(int j=0;j+1<(int)s.size();j++){
            if(s[j]=='1' and s[j+1]=='2') a++;
        }

        if(i+1<=n and len(i)) b++;
    }
    return make_pair(a,b);
}

pair<ll,ll> solve(ll n){
    ll ret=0;

    string s;
    for(ll m=n;m;m/=10) s.push_back('0'+m%10);
    
    reverse(ALL(s));

    // 桁DP
    int m=(int)s.size();
    vector<vector<vector<vector<ll>>>> dp(m+1,vector<vector<vector<ll>>>(2,vector<vector<ll>>(2,vector<ll>(100,0))));
    dp[0][0][0][0]=1;

    rep(i,m){
        int num=s[i]-'0';
        rep(j,2){
            rep(k,2){
                rep(l,80){
                    rep(p,10){
                        if(j==0 and p>num) continue;
                        if(k==1 and p==2) dp[i+1][j or p<num][0][l+1]+=dp[i][j][k][l];
                        else              dp[i+1][j or p<num][p==1][l]+=dp[i][j][k][l];
                    }
                }
            }
        }
    }
    rep(j,2)rep(k,2)rep(l,10){
        ret+=dp[m][j][k][l]*l;
    }


    ll unko=0;

    // len
    if(n>=2) unko++;

    if(s.size()<=2){
        return make_pair(ret,unko);
    }

    int i;
    for(i=0;i+2<(int)s.size();i++){
        unko+=p10[i];
    }
    if(s[0]=='2'){
        ll add=0;
        for(int i=1;i<(int)s.size()-1;i++) add=add*10+(s[i]-'0');
        
        add++;
        if(s.back()<'2'){
            add--;
        }
        unko+=max(0ll,add);
        return {ret,unko};
    }else if(s[0]<'2') return {ret,unko};
    else return {ret,unko+p10[i]};
}

signed main(){
    ll a,b;cin>>a>>b;
    ll res=0;
    auto [x,y]=solve(b);
    res+=x+y;
    tie(x,y)=solve(a-1);
    res-=x+y;
    if(len(a-1)) res--;
    cout<<res<<endl;
    return 0;
}