import java.io.*;
import java.util.*;
import java.math.*;

public class fibs {
    public static  void main(String[] args) throws Exception {
	BufferedReader r=new BufferedReader(new FileReader("fibs.in"));
	//ifstream file();
	String l,s;

	int i;
	
	double n1,n2,y1,y2,z1,z2;
	BigDecimal x1,x2,nul=new BigDecimal("0");
	BigDecimal A,C;
	BigDecimal Y1,Y2;
	double a,c,k;
	
	c = (Math.sqrt(5)+1)/2;
	a = 1/c;
	
	A = new BigDecimal(a);
	C = new BigDecimal(c);

	while(true) {
	    try{
		l = r.readLine();
		//System.out.println(l);
		if (l==null) break;
		StringTokenizer t=new StringTokenizer(l);
		s = t.nextToken();
		z1 = s.length()-20;
		x1 = new BigDecimal(s);
		s = t.nextToken();
		z2 = s.length()-20;
		x2 = new BigDecimal(s);
		if (x1.equals(nul) && x2.equals(nul)) break;
		//System.out.println(x1.toString());
		//System.out.println(x2.toString());

		if (z1<0) z1= 0;
		if (z2<0) z2= 0;

		s = "1";
		for (i=0;i<z1;i++) s+="0";
		Y1 = new BigDecimal(s);
		
		x1 = x1.divide(A,BigDecimal.ROUND_DOWN);
		x1 = x1.divide(Y1,BigDecimal.ROUND_DOWN);

		k = z1*Math.log(10.0);		
		y1 = (Math.log(x1.doubleValue())+k)/Math.log(c);
		n1 = y1;
		
		//System.out.println("k=" + k);

		s = "1";
		for (i=0;i<z2;i++) s+="0";
		Y2 = new BigDecimal(s);
		
		x2 = x2.divide(A,BigDecimal.ROUND_DOWN);
		x2 = x2.divide(Y2,BigDecimal.ROUND_DOWN);

		k = z2*Math.log(10.0);		
		y2 = (Math.log(x2.doubleValue())+k)/Math.log(c);
		n2 = y2;

		//System.out.println("k=" + k);

		//System.out.println("" + z1 + " " + z2);
		//System.out.println("Y1=" +Y1);
		//System.out.println("Y2=" +Y2);



		System.out.println(""+((int)Math.floor(n2)-(int)Math.ceil(n1)+1));
	    }
	    catch(Exception e) {
		break;
	    }
	}
	System.exit(0);
    }
}
/*    file >> x1 >> x2;
    if (x2==x1 && x1==0) break;

    n1 = log(x1/a)/log(c);
    n2 = log(x2/a)/log(c);

    cout << (int)floor(n2-n1+0.5) << endl;
    
  }

  return 0;
}
*/