/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class firstprog
{
	public static void main (String[] args) throws java.lang.Exception
	{
		char a ='F' ;
		char b ='U' ;
		char c ='C' ;
		char d ='K' ;
		
		System.out.print(a);
		System.out.print(b);
		System.out.print(c);
		System.out.print(d);
		
		
	}
}