s=input()
c=0
sm=0
for i in s:
if i.isupper():
c+=1
else:
sm+=1
if c>sm:
print(s.upper())
else:
print(s.lower())
#include<iostream>
#include<string>
using namespace std;
int main()
{
string s;
cin>>s;
int a=0,A=0;
for(auto x:s)
{ if(isupper(x))
{
A++;
}
if(islower(x))
{
a++;
}
}
if(A<=a)
{
for(int i=0;i<s.size();i++)
{
if(isupper(s[i]))
{
s[i]=tolower(s[i]);
}
}
}
else if(A>a)
{
for(int i=0;i<s.size();i++)
{
if(islower(s[i]))
{
s[i]=toupper(s[i]);
}
}
}
cout<<s<<endl;
return 0;
}
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