/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.text.*;
/* 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
	{
		Scanner scn = new Scanner(System.in);
		int loop;
		float temp,sum=0,num;
		while(scn.hasNext()){
			String[] str = scn.nextLine().split(" ");
			float[] arr = new float[str.length];
			for(loop=0;loop<str.length;loop++){
				temp = Integer.parseInt(str[loop]);
				arr[loop] = temp;
				sum += arr[loop];
				if(loop==(arr.length-1)){
					System.out.println(arr.length);
					sum /= arr.length;
					DecimalFormat df = new DecimalFormat();
					df.applyPattern("0.000");
					System.out.println(df.format(sum));
					sum = 0;
				}
			}
		}
	}
}

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

MSAyIDMKMSAyIDMKMSAyIDM=

1 2 3
1 2 3
1 2 3