#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<to;x++)
#define FORR(x,arr) for(auto& x:arr)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
//-------------------------------------------------------

string decdec(string A) {
	reverse(A.begin(),A.end());
	FORR(r,A) {
		if(r--!='0') break;
		r='9';
	}
	if(A.back()=='0') A.resize(A.size()-1);
	reverse(A.begin(),A.end());
	return A;
}

string A,B;
ll p10[20];
ll memo[20][2][2];

ll dp(int d,string &s, int lead,int one) {
	if(d>=s.size()) return 0;
	if(memo[d][lead][one]>=0) return memo[d][lead][one];
	ll ret=0;
	int i;
	
	if(lead) {
		FOR(i,s[d]-'0') {
			if(i==2 && one) ret += p10[s.size()-1-d];
			
			if(i==1) ret += dp(d+1,s,0,1);
			else ret += dp(d+1,s,0,0);
		}
		if(s[d]=='2' && one) ret += atoll(s.substr(d+1).c_str())+1;
		ret += dp(d+1,s,1,(s[d]=='1'));
		
	}
	else {
		FOR(i,10) {
			if(i==2 && one) ret += p10[s.size()-1-d];
			if(i==1) ret += dp(d+1,s,0,1);
			else ret += dp(d+1,s,0,0);
		}
	}
	
	return memo[d][lead][one]=ret;
}

ll inc(string s) {
	if(s.size()<=1) return 0;
	if(s.size()==2) return s>="12";
	MINUS(memo);
	return dp(0,s,1,0);
}

ll con(string a) {
	if(a.size()<2) return a[0]>='2';
	
	int low=(a.back()-'0');
	a.pop_back();
	if(low<2) a=decdec(a);
	
	
	ll ret=1;
	int i;
	FOR(i,a.size()) {
		
		if(i || a[0]>'2') {
			ret += p10[a.size()-1-i];
		}
		else if(a[i]=='2') {
			string b=a.substr(1);
			ret += atoll(b.c_str())+1;
		}
		
	}
	return ret;
	
}

void solve() {
	int i,j,k,l,r,x,y; string s;
	p10[0]=1;
	FOR(i,18) p10[i+1]=p10[i]*10;
	
	cin>>A>>B;
	int c=(A=="2" || (A.size()>1 && A.back()=='2' && A[0]=='2'));
	A=decdec(A);
	
	cout<<(inc(B)+con(B)-inc(A)-con(A)-c)<<endl;
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false);
	FOR(i,argc-1) s+=argv[i+1],s+='\n';
	FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	solve(); return 0;
}