Task
Time limit: 1000 ms,
Memory limit: 256 Mb

Rabbit Clover with friends began to study mathematics. The first thing they learned is that all numbers are made up of digits.
Write a program that will help Rabbit Clover determine how many dozens in a given number.
Recall that tens is the penultimate digit of a number

Input: a natural number is entered.
Output: output the answer to the problem.

Examples

¹	Âõîäíûå äàííûå	Âûõîäíûå äàííûå
1	179	7
2	40	4