Count Nines in Array

Background

Dawei is organizing a list of numbers and wants to know how many of a specific number are present.

Problem Description

Given an array of integers, return the number of times the digit $9$ appears in the array.

Input Format

The input consists of a single line containing several space-separated integers, representing the elements of the array.

Output Format

Output a single integer, representing the number of times the digit $9$ appears in the array.

Sample

1 2 9

1

1 9 9

2

1 9 9 3 9

3

Sample Explanation

Sample 1: The array [1 2 9] contains one $9$. Sample 2: The array [1 9 9] contains two $9$s. Sample 3: The array [1 9 9 3 9] contains three $9$s.

Constraints

Time limit: $1$ second, Memory limit: $1024$ KiB for each test case.