Problem Description

In the school that Takahashi attends, students who enrolled in the year the school was founded are called the $1$st generation, those who enrolled the following year are called the $2$nd generation, and so on.

That is, when (the year of enrollment $-$ the year the school was founded) $+ 1 = n$, the student is referred to as the $n$th generation.

Additionally, every student in Takahashi's school has an ID, and it is known that each ID always contains the number corresponding to their generation.

Given a student's ID as a string $S$, please determine which generation the student belongs to.

If two digits are consecutive in the string, they represent a two-digit number.

Input Format

The input is given from the standard input in the following format:

$S$

Output Format

The output consists of one line. When the student is the $n$th generation, output $n$ on the first line.

Sample Input and Output

Sample Input #1

chokudai55

Sample Output #1

55

Sample Input #2

cho9dai

Sample Output #2

9

Notes/Hints

• $S$ is composed of uppercase or lowercase alphabets, or digits.
• $S$ contains either one or two digits.
• If $S$ contains two digits, they are consecutive.
• The first digit in $S$ is not $0$.
• $3 \leq \lvert S \rvert \leq 10$

见题面 Input 部分

见题面 Output 部分