#include <bits/stdc++.h>
using namespace std;
int main() {
	char n;
	cin>>n;
	if(int(n)>=65&&int(n)<90){
	    cout<<"upper";
	}else if(int(n)>=97&&int(n)<=122){
		cout<<"lower";
	}else if(int(n)>=48&&int(n)<=57){
		cout<<"digit";
	}
}    
/**************************************************************
	Problem: 1970
	User: wangyiyang
	Language: C++
	Result: Wrong Answer
****************************************************************/