#include <iostream>
using namespace std;

void output(char c)
{
	
	if((int)'A'<=(int)c &&(int)c<=(int)'Z')
		putchar((int)'A'+((int)c-(int)'A'+3)%((int)'Z'-(int)'A'));
	else if((int)'a'<=(int)c &&(int)c<=(int)'z')
		putchar((int)'a'+((int)c-(int)'a'+3)%((int)'z'-(int)'a'));
	else
                putchar(c);
}

int main()
{
	char character;
	cout<<"Please enter a line of text:";
	do
        { character = getchar();
          output(character);
        }
        while( character != '\n' );
	return(0);
}