I want to replace the character ‘e’ with ‘E’ in a word “Hello”. I'm reading the arguments from the prompt.

```
class LowToUpCase{
    public static void main(String[] args){
        if (args.length != 0) {
            String str = args[0];
            str = str.substring(1,2);
            System.out.println(str.toUpperCase());  
        }else{
            System.out.println("Give arguments");
        }
    }
}

```

Im getting the output as the Capitalised E only. But I'm not getting any idea how to get the output as hEllo . Please give me the hint to get the needed output.