/* A program which implements Caesar's cipher */

import java.io.*;  //This is the java input output library

public class Caesar
{

	/*This is the main program.*/
	public static void main(String[] args) throws IOException
	{
		BufferedReader in =new BufferedReader(new InputStreamReader(System.in));  //reader for keyboard
		int key=22; //I have chosen 22 to be my key value but you can change this to any value between 0 and 25
		System.out.println("Enter your plaintext: ");
		String s=in.readLine();   // string s now contains the plaintext
		System.out.println();
		System.out.println();
		for(int i=0;i<s.length();i++)  //we look at the plaintext one character at a time
		{
			int current=s.charAt(i);   //current holds the character as an int value - the ASCII value
			if(current>64 && current<91)  //if the character is an upper case letter
			{
				current=current+key;  //add the key value onto the ASCII value
				if(current>90) current=current-26;  //if we've come off the end of the alphabet then we loop
			}										//back around by subtracting 26.
			else if(current>96 && current<123) //if the character is a lower case letter
			{
				current=current+key;
				if(current>122)current=current-26;
			}
			System.out.print((char)(current));  //now we print out the encrypted character or if the character
		}System.out.println();					//was not a letter then we print the original character.
	}
}