#include <iostream>
 #include <iomanip>
 #include <cmath>
 #include <algorithm>
 #include <cstdlib>
 #include <limits.h>
 #include <string>

 #define ll long long

 using namespace std;
 void Fast_IO();
 void Rofyda_Elghadban(){
   #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
}

 /*ll gcd(ll num1,ll num2){
  while(num2!=0){
    ll temp=num1;
    num1=num2;
    num2=temp%num1;
  }
  return num1;
 }

 ll lcm(ll num1,ll num2){
  return(num1/gcd(num1,num2))*num2;
 }*/

int main()
 {   Rofyda_Elghadban();
 //Fast_IO();
 //freopen("input.txt","r",stdin);
 //freopen("output.txt","r",stdout);
 string s;
 cin>>s;
 int capital=0,small=0;
 for(int i=0;i<s.size();i++){
  if(s[i]>=65&&s[i]<=90){
    capital++;
  }else if(s[i]>=97&&s[i]<=122){
    small++;
  }
 }if(capital>small){
  for(int i=0;i<s.size();i++){
    s[i]-=32;
    cout<<s[i];
  }
 }else if(small>=capital){
  for(int i=0;i<s.size();i++){
    s[i]+=32;
    cout<<s[i];
  }
 }






 return 0;
 }