public static void main(String[] args) {

java.util.Scanner sc=new java.util.Scanner(System.in);

System.out.print("Enter a letter : ");

String letter=sc.nextLine();

while(letter.length()<=0 || letter.length()>300){

System.out.print("Try again ! , Enter a letter : ");

letter=sc.nextLine();

}

char [] forShift=letter.toCharArray();

for(char e : forShift){

switch(e){

case '^':

case '&':

case '#':

case '@':

case '*':

case '(':

case '!':

case '/':

case ' ': System.out.print(e); break;

default :

if(!Character.isLowerCase(e) && (e+3)>90){

System.out.print((char)(((e+3)-65)%26+65));

}

else if(Character.isLowerCase(e) && (e+3)>122){

System.out.print((char)(((e+3)-97)%26+97));

}

else{

System.out.print((char)(e+3));

}

break;

}

}

}