[java] String index out of range: 4

I am a beginner here to Java. So I tried to run this code here, but it kept giving me this error:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 4. 

I need some help. Here is my code:

import java.util.Scanner;  public class TestFour { public static void main(String[]args) {    String inp= new String();   Scanner scan = new Scanner(System.in);   System.out.println("Enter Word ");   inp = scan.nextLine();   int output = 1;   int [] board = new int[40];   int points = 0;    int totalpoints = 0;   int input;   //start of for loop   for(int i = 0; i < 5; i++)   {      input = scan.nextInt();      for (int j = 0; j < inp.length(); j++)      {         //values of letters         if(inp.charAt(i) == 'a' || inp.charAt(i) == 'e')         {            points = 1;         }         else if(inp.charAt(i) == 'd' || inp.charAt(i) == 'r')          {            points = 2;         }         else if(inp.charAt(i) == 'b' || inp.charAt(i) == 'm')         {            points = 3;         }         else if(inp.charAt(i) == 'v' || inp.charAt(i) == 'y')         {            points = 4;         }         else if(inp.charAt(i) == 'j' || inp.charAt(i) == 'x')         {            points = 8;         }         else         {            points = points;          }         //checking if double letter or triple letter and executing program         if ( input % 3 == 0 && input % 6 != 0)         {            points = points * 2;         }         else         {            points = points;          }            if (input % 5 == 0 && input != 15)         {            points = points * 3;         }         else          {            points = points;         }         totalpoints = totalpoints + points;         input = input + 1;      }//end of for loop      input = input - 4;      //checking if double word or triple word and executing program      for (int k = 0; k < inp.length(); k++)      {            if (input % 7 == 0 && input != 21 && input != 25)         {            totalpoints = totalpoints * 2;         }         else         {            totalpoints = totalpoints;         }          if (input % 8 == 0 && input != 40)         {            totalpoints = totalpoints * 3;         }         else         {            totalpoints = totalpoints;         }         input = input + 1;      }   }   System.out.println(totalpoints); } } 

The problem starts at the for loop the fifth time I enter the input. Thank you for your time. I really don't get how to fix it even though I know what is going on.