Please help me with fixing this java code:

import java.io.*;

import java.util.*;

public class HW_practice{

private static int[][] array;

private static int row, col;

public static void readArray(){

String fileName = "example.txt";

BufferedReader br = null;

FileReader fr = null;

try{

fr = new FileReader(fileName);

br = new BufferedReader(fr);

String currentLine;

int i = 0, r = 0, c = 0;

while ((currentLine = br.readLine()) != null){

StringTokenizer st = new StringTokenizer(currentLine);

if(i++ == 0){

while(st.hasMoreTokens()){

row = Integer.parseInt(st.nextToken());

st.nextToken();

col = Integer.parseInt(st.nextToken());

}

array = new int[row][col];

continue;

}

c = 0;

while(st.hasMoreTokens()){

array[r][c++] = Integer.parseInt(st.nextToken());

}

r++;

}

br.close();

} catch (IOException e){

System.err.println(e);

}

}

public static void print(){

for(int[] a: array){

for(int num: a){

System.out.print(num + " ");

}

System.out.println();

}

}

public static void command(String com1, String com2){

if(com1.substring(0,1).equals("S") || com2.substring(0,1).equals("S")){

shiftCommand(com1.substring(1,3), com2.substring(1,3));

}

else if(com1.substring(0,1).equals("F") || com2.substring(0,1).equals("F")){

flipCommand(com1.substring(1,3), com2.substring(1,3));

}else{

System.out.println("Please enter valid command.");

}

}

public static void shiftCommand(String shift1, String shift2){

int num = Integer.parseInt(shift1.substring(1,3));

if(shift1.charAt(1) == 'C' || shift2.charAt(1) == 'C'){

int key = array[4][num-1];

int col = 0;

for(int i = 0; i < col; i++){

int temp = array[i][num-1];

array[i][num-1] = key;

key = temp;

}

}else{

int key = array[num-1][4];

int row = 0;

for(int i = 0; i < row; i++){

int temp = array[num-1][i];

array[num-1][i] = key;

key = temp;

}

}

}

public static void flipCommand(String flip1, String flip2){

int num = Integer.parseInt(flip1.substring(1,3));

if(flip1.charAt(1) == 'C' || flip2.charAt(1) == 'C'){

for(int i = 0; i < array.length/2; i++){

int temp = array[i][num-1];

array[i][num-1] = array[array.length-1-i][num-1];

array[array.length-1-i][num-2] = temp;

}

}else{

for(int i = 0; i < array.length/2; i++){

int temp = array[num-1][i];

array[num-1][i] = array[num-1][array.length-1-i];

array[num-1][array.length-1-i] = temp;

}

}

}

public static void main(String []args){

Scanner console = new Scanner(System.in);

System.out.println("Please enter your command: ");

String com1 = console.next();

String com2 = console.next();

console.close();

command(com1, com2);

print();

}

}

I was supposed to get the user input as following:

Please enter your command:

SC3 FR1

And got this error message:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 3

at java.lang.String.substring(String.java:1963)

at HW_practice.shiftCommand(HW_practice.java:71)

at HW_practice.command(HW_practice.java:61)

at HW_practice.main(HW_practice.java:117)