#include<stdio.h>
int main()
{
    char sivan[100];
    gets(sivan);
    int countu=0;
    int countl=0;
    int i;
    for(i=0; sivan[i]!='\0'; i++)

    {
        if('A'<=sivan[i] && sivan[i]<='Z')
            countu++;
        else if('a'<=sivan[i] && sivan[i]<='z')
            countl++;
    }
    if(countu==countl)
    {
        i=0;
        while (sivan[i])
        {
            sivan[i] =tolower(sivan[i]);
            i++;
            printf("%c",sivan[i]);

        }
    }
    else if(countu>countl)
    {
        i=0;
        while (sivan[i])
        {
            sivan[i] =toupper(sivan[i]);
            i++;
            printf("%c",sivan[i]);

        }
    }
    else if(countl>countu)

    {
        i=0;
        while (sivan[i])
        {
            sivan[i] =tolower(sivan[i]);
            i++;
            printf("%c",sivan[i]);

        }
    }

}
return 0;
}