#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main() {
	int n, p, p1, pp, a = 0, l = 0, c = 0, l1, bc =0;
	while (scanf("%d", &n)) {
		if (n >= 10) {
			p = n;
			l1 = n;
			if (p % 10 > (p / 10) % 10)
				a = 0;
			else
				a = 1;

			//printf("%d\n", a);

			while (p >= 10) {

					if (a == 0&&p >= 10)
					{

						if (p % 10 > (p / 10) % 10) {
							a = 1;
							p /= 10;
							l++;
						}
						else {
							l = 0;
							break;
						}

					}
					if (a == 1 && p >= 10) {

						if (p % 10 < (p / 10) % 10) {
							a = 0;
							l++;
							p /= 10;
						}
						else {
							l = 0;
							break;
						}


				}

			}



			while (l1) {
				bc++;
				l1 /= 10;
			}
		//	printf("%d", l);
			if (l == (bc - 1)) {
				printf("%d\n", n);
			}
			bc = 0;
			l = 0;
		}
	}



	return 0;
}

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main() {
	int n, p, p1, pp, a = 0, l = 0, c = 0, l1, bc = 0;
	while (scanf("%d", &n)) {
		if (n >= 10) {
			p = n;
			l1 = n;
			if (p % 10 >= 5)
				a = 0;
			else
				a = 1;

			//printf("%d\n", a);

			while (p) {

				if (a == 0&&p)
				{

					if (p % 10 >= 5) {
						a = 1;
						p /= 10;
						l++;
					}
					else {
						l = -1;
						break;
					}

				}
				if (a == 1 && p) {

					if (p  % 10 < 5) {
						a = 0;
						l++;
						p /= 10;
					}
					else {
						l = -1;
						break;
					}


				}

			}



			while (l1) {
				bc++;
				l1 /= 10;
			}
				//printf("%d", l);
			if (l == (bc)) {
				printf("%d\n", n);
			}
			bc = 0;
			l = 0;
		}
	}



	return 0;
}