Area of Square

Time Limit: 1 sec

**The Problem**

A **Square** is a flat shape with **4 equal sides** and every angle is a **right angle (90°)**

Characteristic of Square

1. All sides are equal in length

2. Each internal angle is 90°

3. Opposite sides are parallel

The Area of square is the **side length(a) squared.**

**Area = a ^{2} = a x a**

Write a program that read an integer number which is the side length (**a**) of Square, your task is to find the area of the Square.

**The Input**

Input file contain a series of line, each line contains only one integer numbers **a** , which is the side length of square (0<**a**<=1000). Input is terminated by **EOF**.

**The Output**

For each line of input, output will show the one integer number which is the area of the square in a separate line.

**Sample Input**

10

20

5

**Sample Output**

100

400

25

Problem Setter: Shahin ShamS