#include <bits/stdc++.h>
using namespace std;

int main(){
	char c;
	cin>>c;
	if(isupper(c)){
		cout<<"upper";
	}else if(islower(c)){
		cout<<"lower";
	}else if(isdigit(c)){
		cout<<"digit";
	}
}


/**************************************************************
	Problem: 1970
	User: admin
	Language: C++
	Result: Accepted
	Time:29 ms
	Memory:2072 kb
****************************************************************/