#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: huanghengyi
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/