package q8xx;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class Q850 {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		long a = nl(), b = nl();
		out.println(countInner(b) - countInner(a-1) + countOuter(b-1) - countOuter(a-1));
	}
	
	// contains 12
	long countInner(long n)
	{
		char[] s = Long.toString(n).toCharArray();
		int m = s.length;
		long[][] dp = new long[m+1][2];
		long ret = 0;
		int es = 0;
		int num = 0;
		for(int i = 0;i < m;i++){
			ret *= 10;
			for(int j = 0;j <= 9;j++){
				for(int k = 0;k < 2;k++){
					if(f(k, j) == 2){
						ret += dp[i][k];
						dp[i+1][0] += dp[i][k];
					}else{
						dp[i+1][f(k,j)] += dp[i][k];
					}
				}
			}
			
			for(int j = 0;j < s[i]-'0';j++){
				ret += num;
				if(f(es, j) == 2){
					ret++;
					dp[i+1][0]++;
				}else{
					dp[i+1][f(es,j)]++;
				}
			}
			es = f(es, s[i]-'0');
			if(es == 2){
				num++;
				es = 0;
			}
		}
		ret += num;
		return ret;
	}
	
	int f(int pre, int cur)
	{
		if(pre == 0){
			if(cur == 1){
				return 1;
			}else{
				return 0;
			}
		}else if(pre == 1){
			if(cur == 1){
				return 1;
			}else if(cur == 2){
				return 2;
			}else{
				return 0;
			}
		}else if(pre == 2){
			return 2;
		}else{
			throw new RuntimeException();
		}
	}
	
	// 2...1 or 1
	long countOuter(long n)
	{
		char[] s = Long.toString(n).toCharArray();
		int m = s.length;
		long[] dp = new long[m+1];
		int es = 0;
		for(int i = 0;i < m;i++){
			if(i < m-1){
				dp[i+1] = dp[i] * 10;
				
				if(i == 0){
					if(2 < s[i]-'0'){
						dp[i+1]++;
					}
				}else{
					dp[i+1]++;
					if(es == 1){
						dp[i+1] += s[i]-'0';
					}
				}
				if(i == 0 && s[i] == '2')es = 1;
			}else{
				dp[i+1] += dp[i];
				if(i == 0){
					if(1 <= s[i]-'0'){
						dp[i+1]++;
					}
				}else{
					dp[i+1]++;
					if(es == 1 && 1 <= s[i]-'0'){
						dp[i+1]++;
					}
				}
			}
		}
		
		return dp[m];
	}
	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new Q850().run(); }
	
	private byte[] inbuf = new byte[1024];
	private int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}