#include <stdio.h>

int main() {
	int rc, start, end;

	printf("Start: ");
	rc = scanf("%d", &start);
	if (rc != 1) {
		printf("Please enter a real integer\n");
		return 1;
	}
	printf("End: ");
	rc = scanf("%d", &end);
	if (rc != 1) {
		printf("Please enter a real integer\n");
		return 1;
	}

	if (start > end) {
		printf("Please ensure that start value is smaller than end value\n");
		return 1;
	}

	for (int i = start; i <= end; i++) {
		printf("%d %d\n", i, i*i);
	}

	return 0;
}