# How Many Fibs?

Time Limit: 1 Second Memory Limit: 32768 KB

Recall the definition of the Fibonacci numbers:
f1 := 1

f2 := 2

fn := fn-1 + fn-2 (n >= 3)

Given two numbers a and b, calculate how many Fibonacci numbers are in the range [a, b].

## Input

The input contains several test cases. Each test case consists of two non-negative integer numbers a and b. Input is terminated by a = b = 0. Otherwise, a <= b <= 10^100. The numbers a and b are given with no superfluous leading zeros.

## Output

For each test case output on a single line the number of Fibonacci numbers fi with a <= fi <= b.

## Sample Input

10 100 1234567890 9876543210 0 0

## Sample Output

5 4Submit

Source: University of Ulm Local Contest 2000