for this question

Write a program that counts the number of times a digit appears in a telephone number. Your program should create an array of size 10 that will hold the count for each digit from 0 to 9. Read a telephone number from the keyboard as a string. Examine each character in the phone number and increment the appropriate count in the array. Display the contents of the array.

I did this code.

import java.util.Scanner;

public class M7 {

public static void main(String[] args) {

String phonenumber;

int digits [ ] = new int [10];

Scanner key = new Scanner (System.in);

System.out.println("Enter a telephone number");

phonenumber = key.next();

for( int i=0; i < phonenumber.length(); i++)

{ String ch= phonenumber.substring(i,i+1);

int a= Integer.parseInt(ch);

digits[a]++;

}

for( int i=0; i < digits.length; i++)

System.out.println( digits[i]);

}

}

When I entered the phone number like this (312) 244-4677

it did not work and gave this message

Exception in thread "main" java.lang.NumberFormatException: For input string: "("

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)

at java.lang.Integer.parseInt(Integer.java:569)

at java.lang.Integer.parseInt(Integer.java:615)

at M7.main( M7.java:13)

How can I fix it?

Can anyone help me please to be the success?