#include <stdio.h>

char a[1000005];

int main() {
	int i = 0;
	for(;;) {
		char c;
		for (int k=0; k < i+5; k++)
			a[k] = 0;
		i = 0;

		
		for(;;) {
			if(scanf("%c", &c) != 1) {
				return 0;
			}
			if (c == '\n')
				break;
			a[5+i++] = c-'0';
		}
		
		a[i+4]++;
		for (int k = i+4; k >= 0; k--) {
			switch (a[k]) {
				case 0: continue;
				case 1: continue;
				case 2: 
					if (a[k-1] >= 1) {
						a[k] = 0; a[k-1]--;
					} else {
						a[k] = 0;
						a[k-1]++; a[k-2]++;
					}
					break;
				case 3: 
					if (a[k-1] >= 1) {
						a[k] = 1; a[k-1]--;
					} else if (a[k-1] == 0) {
						a[k] = 1;
						a[k-1]++; a[k-2]++;
					} else {
						printf("undef\n");
					}
					break;
				default:
				printf("undef2\n");
			}
			
			

		
		
		

		}
		
		int write = 0;
		for (int k = 0; k < i+5; k++) {
			if ((a[k] == 1) || (k == i+4))
				write = 1;
			if (write)
				printf("%d", a[k]);
		}
		printf("\n");
		
	}
	
	
}