#include<iostream>
using namespace std;

int main(){

  char ch;
  cin>>ch;

  if((ch>=65) && (ch<=90)){
    cout<<"Uppercase"<<endl;
  }else if((ch>=97) && (ch<=122)){
    cout<<"lowercase"<<endl;
  }else{
     cout<<"Invalid char"<<endl;
  }



  return 0;
}