#include <fcntl.h> // open, close, O_RDONLY
#include <stdio.h> // printf, scanf, perror
#include <unistd.h> // read

// print characters from column m to n (1 indexed) for each row
int main(int argc, char* argv[]) {
	int f = open(argv[1], O_RDONLY);
	if (f < 0) {
		perror("open");
		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;
			printf("\n");
			continue;
		}

		if (m <= col && col <= n) {
			printf("%c", buf);
		}
		col++;
	}

	close(f);
}