#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>

int main(int argc, char *argv[]) {
	int f = open(argv[1], O_RDONLY);
	if (f == -1) return 1;

	int m, n;
	scanf("%d-%d", &m, &n);
	
	int col = 1;
	char buf;
	while (read(f, &buf, 1)) {
		if (buf == '\n') {
			col = 1;
			write(0, &buf, 1);
			continue;
		}
		if (m <= col && col <= n) {
			write(0, &buf, 1);
		}
		col++;
	}

	close(f);
}