Problems

# Numbers

# Numbers

There was nothing to do, it was in the evening ... Since Timur has a big team and a lot of paper, the work was found.

Take the number **a**. Take the number **b**. And write down all the numbers from **a** to **b**. Calculate the sum of all written digits.

#### Input

Two positive integers **a** and **b** (**a** ≤ **b**). The numbers do not exceed `10`

.^{12}

#### Output

Print the sum of all written digits.

Input example #1

1 10

Output example #1

46