#include<bits/stdc++.h>
using namespace std;
int main()
{
    char n;
    cin>>n;
    if ('A'<=n && n<='Z'){
    	cout<<"upper case";
	}
	if ('a'<=n && n<='z'){
		cout<<"lower case";
    }
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
char n;
int main(){
	cin>>n;
	if(n>='A'&&n<='Z'){
		cout<<"upper case";
	}else{
		cout<<"lower case";
	}
	
	return 0;
}