/* 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) throws java.lang.Exception
	{
		System.out.println(autocasas(5f/7));
		System.out.println(autocasas(5f/2));
		System.out.println(autocasas(123f));
		System.out.println(autocasas(-1f/5));
	}
 
	static String autocasas(float numero)
	{
		String[] partes = String.valueOf(numero).split("\\.");
		if (partes[1].equals("0")) return String.valueOf(partes[0]);
		return String.valueOf(partes[0]) + "," + String.valueOf(partes[1]);
	}
}
 
 

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