# Difference of Squares

Given two integers $a$ and $b$. Calculate $a^2 - b^2$ modulo ($10^6+7$).

## Input format
Two non-negative integers $a$ and $b$ not exceeding $10^5$.

## Output format
Print one integer - the value of $a^2 - b^2$ modulo ($10^6+7$).

### Sample 1
#### Input

3 2

#### Output

5

### Sample 2
#### Input

1000 1001

#### Output

998006