#include <stdio.h>
#include <stdlib.h>

int isAlphaNum (char input) {

    if ((input > 47 && input < 58) || (input > 65 && input < 91) || (input > 96 && input < 123)) {
        return 1;
    }
    return 0;
}

int readInput (int col, int spaces[1000], char str[col][100], int x, int y, int word) {

    char ch;
    scanf("%c", &ch);

    if (ch == EOF || ch == '\n') {
        return word + 1;
    }

    if (!isAlphaNum(ch)) {
        spaces[word] = ch;
        return readInput(col, spaces, str, x, y, word);
    }
    
    if (col == x) {
        x = 0;
        y++;
    }

    str[x][y] = ch;
    return readInput(col, spaces, str, x+1, y, word + 1);
}

int main (int argc, char *argv[]) {

    int col;
    scanf("%d", &col);

    char str[col][100];
    for (int i = 0; i < col; i++) {
        for (int j = 0; j < 100; j++) {
            str[i][j] = 0;
        }
    }
    int spaces[1000] = {0};

    getchar();
    int words = readInput(col, spaces, str, 0, 0, 0);

    int space = 0, k = 0;
    for (int i = 0; i < col; i++) {
        for (int j = 0; j < 100; j++) {
            
            if (str[i][j] > 50) {
                printf("%c", spaces[k]);
                k++;
            }
            printf("%c", str[i][j]);
        }
    }
    printf("%c\n", spaces[k]);

    return 0;
}