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

int main(void)
{
    int n;
    char c;
    char s[1000000];
    scanf("%d\n",&n);
    c=getchar();
    int k=0;
    while(c!='EOF'){
        s[k]=c;
        c=getchar();
        k++;
    }
    int len=strlen(s);
    int N=0;
    for(int i=0;i<len;i++){
        if (s[i]==' ') N++;
    }
    int lish=n-len;
    int u;
    if(lish%N!=0) u=lish/N+1;
    else u=lish/N;
    for(int i=0;i<len;i++){
        if (s[i] != ' ')
            printf("%c",s[i]);
        else {
            for(int j=0;j<u;j++){
                putchar(' ');
            }
            if(N!=1){
                lish-=u;
                N--;
                if (N==0) {printf("NO"); return 0;}
                if (lish%N!=0)
                    u=lish/N+1;
                else
                    u=lish/N;
            }}
    }
    return 0;
}