GEEKOUNT - EVEN COUNT
Let f(x) be the product of digits of a number.
Given L and R, find the number of values of 'i' such that L <= i <= R and f(i) is even.
The first line consists of an integer t, the number of test cases. For each test case, you are given the two integers L and R.
For each test case, print the number of values of 'i' such that L <= i <= R and f(i) is even.
1 <= t <= 100
1 <= L <= R <= 1000000000