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

int main()
{
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif // ONLINE_JUDGE

    string s;
    cin>>s;

    int upper = 0, lower = 0;
    for (int i = 0; i < s.length(); ++i)
    {
        if(s[i]>='A' && s[i]<='Z')
            upper++;
        else
            lower++;
    }

    if(upper>lower)
    {
        for (int i = 0; i < s.length(); ++i)
            if (s[i]>='a')
                s[i]=s[i]-32;
    }
            
    else
    {
        for (int i = 0; i < s.length(); ++i)
        {
            if (s[i]<='Z')
            {
                s[i]=s[i]+32;
            }
        }
    }

    cout<<s<<endl;
    return 0;

}