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

int rate = 8000;

int main(int argc, char * argv[])
{
	if (argc == 2)
	{
		rate = atoi(argv[1]);
	}
	
	int sample = 0;	

	char c;
	while (c != EOF)	
	{

		c = getchar();
		if ((c == ' ')||(c == '\n'))
		{
			if (sample >= rate)
			{
				sample = 0;
				c = '\n';
			}
			else
			{
				sample++;
				c = ' ';
			}
		}
		
		if ((c == EOF)&&(sample < rate))
		{
			int fill;
			for (fill = 0 ; fill < (rate-sample); fill++)
			{
				printf(" _");
			}
			putchar('\n');
		}		
		
		putchar(c);
	}
	return 0;
}