#include <stdio.h>

#define	TRUE	1
#define	FALSE	0

#define	MIN_NUM	1020304050607080900
#define MAX_NUM 1929394959697989990

int digits[] = {0, 9, 8, 7, 6, 5, 4, 3, 2, 1};

int check(long num)
{
	int rem;
	int i = 0;

	while (num>0) {
		rem = num % 10;
		if (rem != digits[i])
			return FALSE;
		num /= 100;
		i++;
	}

	return TRUE;
}


int main(int argc, char **argv)
{
	long i = 1010101011; /* while ((i*i) < MIN_NUM) i++; */

	while ((i*i) < MAX_NUM) {
		if (check(i*i))
			break;
		i++;
	}
	printf("The unique integer is %ld and it's square is %ld\n", i, i*i);
	return 0;
}