import java.lang.Math;

public class NumberUtilities {
    public static String getRange(int start) {
        String sum = "";
        for(int i = 0; i < start; i++){ 
            String range = String.valueOf(i);
            sum += range;
        }
        return sum;
    }

    public static String getRange(int start, int stop) {
        String sum = "";
        for(int i = start; i < stop; i++) {
            String range = String.valueOf(i);
            sum += range;
        }

        return sum; 

    }

    public static String getRange(int start, int stop, int step) {
        String result = "";
        for(int i = start; i < stop; i += step) {
            String range = String.valueOf(i);
            result += range;
        }
        return result;  
    }  

    public static String getEvenNumbers(int start, int stop) {
        String result = "";
        for(int i = start; i < stop; i++) {
            if (i % 2 ==0) {
                String range = String.valueOf(i);
                result += range;
            }

        } return result; 
    }

    public static String getOddNumbers(int start, int stop) {
        String result = "";
        for(int i = start; i < stop; i++) {
            if(i % 2 ==1){
                String range = String.valueOf(i);
                result += range;
            }
        } 
        return result;
        
    }

    public static String getExponentiations(int start, int stop, int exponent) {
         String result = "";
        for (int i = start; i <= stop; i++){
            int stuff = i;
            for (int j = 1; j < exponent; j++){
                stuff *= i ;
            }
            result += stuff;
        }
        return result;
    }
    
}