import java.lang.StringBuilder;


public class NumberUtilities {
    
    public static String getRange(int stop) {
        
        StringBuilder sb = new StringBuilder();
        //for each int between 0 and stop var append i
        for (int i = 0; i < stop; i++) {
            sb.append(i);
        }
        return sb.toString();
    }
    
    public static String getRange(int start, int stop) {
        
        StringBuilder sb = new StringBuilder();
        // for each in bw start and stop append i 
        for (int i = start; i < stop; i++) {
            sb.append(i);
        }
        return sb.toString();
    }


    public static String getRange(int start, int stop, int step) {
        
        StringBuilder sb = new StringBuilder();
        // for each in bw start and stop append i at each interval step
        for (int i = start; i < stop; i += step) {
            sb.append(i);
        }
        return sb.toString();
    }
    
    public static String getEvenNumbers(int start, int stop) {
        
        StringBuilder sb = new StringBuilder();
        // for each in bw start and stop append i if even
        for (int i = start; i < stop; i++) {

            if (i % 2 == 0) {
                sb.append(i);
            }
        }
        return sb.toString();
    }


    public static String getOddNumbers(int start, int stop) {
        
        StringBuilder sb = new StringBuilder();
        // for each in bw start and stop append i if odd
        for (int i = start; i < stop; i++) {
            
            if (i % 2 != 0) {
                sb.append(i);
            }
        }
        return sb.toString();
    }


    public static String getExponentiations(int start, int stop, int exponent) {
        
        StringBuilder sb = new StringBuilder();
        // for each in bw start and stop append i^exp
        
        for (int i = start; i <= stop; i++) {
            sb.append((int)Math.pow(i, exponent));
        }
        return sb.toString();
    }
}