import java.util.*;
import java.lang.*;
import java.io.*;
 
 
public class Main
{
	private static StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
	private static PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
 
	public static void main (String[] args) throws java.lang.Exception
	{
		Double a = 0.0;
		Double b = 0.0;
 
		while(in.nextToken() != StreamTokenizer.TT_EOF){
			a = in.nval;
			out.print(a + b);
			out.print(" ");
			b = a;
		}
		out.flush();
	}
}
 

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