public static void main(String[] args) {
Scanner scn = new Scanner(System.in);
char in = scn.next().charAt(0);
if(in>= 'a' && in<='z') {
System.out.println("lowercase");
}
if (in>= 'A' && in<='Z') {
System.out.println("UPPERCASE");
}
else {
System.out.println("Invalid");
}
}
}