import java.util.Scanner;

public class CaesarCipher
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        int shift;
        int i;
        int n;
        String str;
        String str1="";
        String str2="";
        System.out.println("Enter the plaintext");
        str=sc.nextLine();
        str=str.toLowerCase();
        n=str.length();
        char ch1[]=str.toCharArray();
        char ch3;
        char ch4;
        System.out.println("Enter the value by which each letter of the string is to be shifted");
        shift=sc.nextInt();
 
        System.out.println();
        System.out.println("Encrypted text is");
        for(i=0;i<n;i++)
        {
            if(Character.isLetter(ch1[i]))
            {
                ch3=(char)(((int)ch1[i]+shift-97)%26+97);
                str1=str1+ch3;
            } 
            else if(ch1[i]==' ')
            {
                str1=str1+ch1[i];
            } 
        }
        System.out.println(str1);
        System.out.println();
        System.out.println("Decrypted text is");
 
        char ch2[]=str1.toCharArray();
        for(i=0;i<str1.length();i++)
        {
            if(Character.isLetter(ch2[i]))
            {
                if(((int)ch2[i]-shift)<97)
                {
                    ch4=(char)(((int)ch2[i]-shift-97+26)%26+97);
                }
                else
                {
                    ch4=(char)(((int)ch2[i]-shift-97)%26+97);
                }
                str2=str2+ch4;
            } 
            else if(ch2[i]==' ')
            {
                str2=str2+ch2[i];
            } 
        }
        System.out.println(str2);
     }
}