#154. Three-digit number: first digit minus last digit
You get a three-digit number. Find its **first digit minus last digit**.
### Input
One integer (100 ≤ n ≤ 999).
### Output
One integer.
Examples
Input
489
Output
-5
Input
280
Output
2
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.