Unhappy Numbers

Numbers have feelings too! For any positive integer, square each of its digits and add the squares together. Take that result and repeat the same process.

A number is Happy if, after repeating this process a finite number of times, the sum becomes $1$. The number of iterations a happy number needs to reach $1$ is called its distance from happiness: the distance from happiness of $1$ is $0$, and the distance from happiness of $23$ is $3$, because $2^2 + 3^2 = 13$, then $1^2 + 3^2 = 10$, and finally $1^2 + 0^2 = 1$.

A number is Unhappy if it is infinitely far from happiness: the process never reaches $1$ and instead gets stuck in a repeating loop.

Given the lower and upper bounds of a range of integers, determine how many Unhappy numbers lie in that range (inclusive).

The input contains several test cases. Each test case is a single line with two positive integers $lo$ and $hi$ ($0 < lo \le hi \le 10^{18}$), separated by a single space. The input ends with a line containing two zeros; this terminating line is not a test case and must not be processed.

For each test case, print a single integer on its own line: the count of Unhappy numbers between $lo$ and $hi$ (inclusive). Print no extra spaces, and do not separate answers with blank lines.