#include<bits/stdc++.h>
using namespace std;

#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

#define mygc(c) (c)=getchar_unlocked()
#define mypc(c) putchar_unlocked(c)

#define ll long long
#define ull unsigned ll

void reader(int *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(ll *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(double *x){scanf("%lf",x);}
int reader(char c[]){int i,s=0;for(;;){mygc(i);if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF) break;}c[s++]=i;for(;;){mygc(i);if(i==' '||i=='\n'||i=='\r'||i=='\t'||i==EOF) break;c[s++]=i;}c[s]='\0';return s;}
template <class T, class S> void reader(T *x, S *y){reader(x);reader(y);}
template <class T, class S, class U> void reader(T *x, S *y, U *z){reader(x);reader(y);reader(z);}
template <class T, class S, class U, class V> void reader(T *x, S *y, U *z, V *w){reader(x);reader(y);reader(z);reader(w);}

void writer(int x, char c){int s=0,m=0;char f[10];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(ll x, char c){int s=0,m=0;char f[20];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(double x, char c){printf("%.15f",x);mypc(c);}
void writer(const char c[]){int i;for(i=0;c[i]!='\0';i++)mypc(c[i]);}
void writer(const char x[], char c){int i;for(i=0;x[i]!='\0';i++)mypc(x[i]);mypc(c);}
template<class T> void writerLn(T x){writer(x,'\n');}
template<class T, class S> void writerLn(T x, S y){writer(x,' ');writer(y,'\n');}
template<class T, class S, class U> void writerLn(T x, S y, U z){writer(x,' ');writer(y,' ');writer(z,'\n');}
template<class T> void writerArr(T x[], int n){int i;if(!n){mypc('\n');return;}rep(i,n-1)writer(x[i],' ');writer(x[n-1],'\n');}

char memarr[17000000]; void *mem = memarr;
#define MD 1000000007

ll A, B;
char buf[1000];

int sz;
char arr[100];
ll dp[100][2][2], pt[100][2][2];

void dpp(int d, int las, int fit){
  int i, j, k, sd, slas, sfit;
  ll res = 0;

//  printf("%d %d %d\n",d,las,fit);

  if(dp[d][las][fit] >= 0) return;
  if(d==sz){
    dp[d][las][fit] = 0;
    pt[d][las][fit] = 1;
    return;
  }

  dp[d][las][fit] = pt[d][las][fit] = 0;

  if(fit){
    rep(i,arr[d]+1){
      sd = d+1; slas = (i==1?1:0); sfit = (i==arr[d]?1:0);
      dpp(sd, slas, sfit);
      dp[d][las][fit] += dp[sd][slas][sfit];
      if(las==1 && i==2) dp[d][las][fit] += pt[sd][slas][sfit];
      pt[d][las][fit] += pt[sd][slas][sfit];
    }
  } else {
    rep(i,10){
      sd = d+1; slas = (i==1?1:0); sfit = 0;
      dpp(sd, slas, sfit);
      dp[d][las][fit] += dp[sd][slas][sfit];
      if(las==1 && i==2) dp[d][las][fit] += pt[sd][slas][sfit];
      pt[d][las][fit] += pt[sd][slas][sfit];
    }
  }

//  printf("%d %d %d : %lld %lld\n",d,las,fit,dp[d][las][fit],pt[d][las][fit]);
}

ll solve(ll n){
  int i, j, k;
  ll res = 0, t;

  rep(i,20) rep(j,2) rep(k,2) dp[i][j][k] = -1;
  sprintf(arr, "%lld", n);
  sz = strlen(arr);
  rep(i,sz) arr[i] -= '0';

  dpp(0, 0, 1);
  res += dp[0][0][1];

  if(sz >= 2){
    t = 1;
    REP(i,2,sz){
      res += t;
      t *= 10;
    }
    if(arr[0] > 2){
      res += t;
    } else if(arr[0]==2){
      t = 0;
      REP(i,1,sz) t = t*10 + arr[i];
      if(t%10>=2) res += t/10 + 1; else res += t/10;
    }
  }

  return res;
}

int main(){
  int i, j, k;
  ll res;

  
  reader(&A,&B);

  if(0){
    string str;
    REP(i,A,B+1){
      sprintf(buf,"%d",i);
      str += buf;
    }
    res = 0;
    REP(i,1,str.size()) if(str[i-1]=='1' && str[i]=='2') res++;
    writerLn(res);
  }

  res = solve(B) - solve(A-1);
  if((A-1)%10==1){
    sprintf(buf,"%lld",A);
    if(buf[0]=='2') res--;
  }
  if(A<=2) res++;
  if(B==1) res--;

  writerLn(res);

  return 0;
}