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

/**************************************************************
	Problem: 1970
	User: fzy001
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2072 kb
****************************************************************/