//
// File:   encipher.cc
// Author: cteam044
//
// Created on October 22, 2011, 2:03 PM
//

#include <cstdlib>
#include <cstdio>
#include<cstring>
#include <ctype.h>
#include <iostream>
using namespace std;

char in[10002];
char out[10002];
int step;
int lineLen;

void compute(){
    if ( lineLen <= step){
        printf("%s\n", in);return;}
    
    
    int big, small = lineLen/step;
    int smallCount, bigCount = lineLen - (lineLen/step)  * step;
    if (bigCount == 0) { bigCount = step; smallCount = 0; big = lineLen/step;}
    else { smallCount = step - bigCount; big = small + 1;}
    int  * subStarts = new int[step + 1];
    int increment = 0;
    for (int i = 0; i < bigCount; i++)
        subStarts[increment++] = i * (big);
    for (int i = 0; i < smallCount + 1; i++)
        subStarts[increment++] = (bigCount * (big) ) +  i  * small;
    
    
    int pos = 0;
    for(int i = 0; i < big; i++) {
        for(int box = 0; box < step; box++) {
            if (i + subStarts[box] == subStarts[box + 1] ) continue;
            out[pos++] = in[subStarts[box] + i];
        }
    }
    out[lineLen] = 0;
    printf("%s\n", out);
}

int main(int argc, char** argv) {
    
    while (1){
        scanf("%d", &step);
        while(getchar() != '\n');
        if ( step == 0) break;
        gets(in);
        //in[strlen(in) - 1] = 0;
        int pos = 0;
        lineLen = strlen(in);
        for (int i = 0; i < lineLen; i ++) {
            if (in[i] == ' ') {continue;}
            else in[pos++] = toupper(in[i]);
        }
        in[pos] = 0;
        //printf("%s\n", in);
        
        lineLen = strlen(in);
        compute();
    }
    
    return (0);
}