/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) {
		String result = numbering(1,5);
		System.out.println(result);
	}
 
	public static String numbering(int init, int limit) {
		String output = "";
		int i = init;
		while (i < limit) {
			output += i;
			i++;
		}
		return output;
	}
}

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