import static java.lang.Math.pow;
public class NumberUtilities {

    public static String getRange(int stop) {
        StringBuilder buil=new StringBuilder();
        for(int i=0;i<stop;i++)
        {
            buil.append(i);
        }

        return buil.toString();
    }

    public static String getRange(int start, int stop) {
        StringBuilder buil=new StringBuilder();
        for(int i=start;i<stop;i++)
        {
            buil.append(i);
        }

        return buil.toString();

    }

    public static String getRange(int start, int stop, int step) {
        StringBuilder buil=new StringBuilder();

        
        for(int i=start;i<stop;i=i+step)
        {
            buil.append(i);
        }

        return buil.toString();

        
    }

    public static String getEvenNumbers(int start, int stop) {
        StringBuilder buil=new StringBuilder();
        for(int i=start;i<stop;i++)
        {
            if(i%2==0)
            {
                buil.append(i);
            }
        }

        return buil.toString();
    }

    public static String getOddNumbers(int start, int stop) {
        StringBuilder buil=new StringBuilder();
        for(int i=start;i<stop;i++)
        {
            if(i%2!=0)
            {
                buil.append(i);
            }
        }

        return buil.toString();
    }

    public static String getExponentiations(int start, int stop, int exponent) {
        StringBuilder buil=new StringBuilder();
        for(int i=start;i<=stop;i++)
        {
            int k=(int)(Math.pow(i, exponent));
                
                buil.append(k);
                
        }

        return buil.toString();
    }
}