#include <iostream>
#include <vector>
#include<sstream>
using namespace std;

void lowHighTransform(string &input)
{
    int low=0,high=0;
    // 对比大小写哪个多
    for(int i=0;i<input.length();i++)
    {
        char tmp=input[i];
        if(isalpha(tmp))
        {
            if(islower(tmp))
                low++;
            if(isupper(tmp))
                high++;
        }
    }
    for(int i=0;i<input.length();i++)
    {
        if(low>high)
            input[i]=tolower(input[i]); 
        else if(low<high)
            input[i]=toupper(input[i]);
    }
    
}
int main(int argc, char *argv[])
{
   int everyNchars;
   cin>>everyNchars;
   cin.ignore();
    string input;
    cin>>input;
   
    vector<string> subStrings;
    // 分割字符串
    string tmp;
    stringstream ss;
    ss<<input;
    while(getline(ss,tmp,'-'))
        subStrings.push_back(tmp);
    // 处理除了第一个以外的字符串
    string sumString;
    for(int i=1;i<subStrings.size();i++)
        sumString.append(subStrings[i]);

    // 创建一个新的数组存储新的子串
    vector<string> subStrings2={subStrings[0]};
    for(int i=0;i<sumString.length();)
    {
        string cut=sumString.substr(i,everyNchars);
        subStrings2.push_back(cut);
        i+=everyNchars;
    }
   

   for(int i=0;i<subStrings2.size();i++)
    {
        lowHighTransform(subStrings2[i]);
        cout<<subStrings2[i];
        if(i!=subStrings2.size()-1)
            cout<<"-";
    }

}