#include <stdio.h>
#include <string.h>

int main() {

	char input[1010005];
	
	while(scanf("%s", input) == 1) {
		if (strlen(input) ==2 && input[0] == '1' && input[1] == '1'){
			printf("0\n");
			continue;
		}
		long x = strlen(input) - 1;
		int p = 0;
		while(x >= 0){
			if(input[x] == '0') {
				input[x] = '1';
				break;
			}
			else {
				if(x > 0 && input[x-1] == '1'){
					input[x-1] ='0';
					input[x] = '0';
					break;
				} else {
					if(x == 0) {
						printf("11");
						p = 1;
						input[x] = '0';
						break;
					} else {
						input[x-1] ='1';
						input[x] = '0';
					}
				}
			}
			x-=2;
		}
		long k = 0, len = strlen(input);
		if (p == 0)
		while(input[k] == '0') k++;
		for(;k<len;k++) {
			printf("%c", input[k]);
		}
	

		printf("\n");
	}

	

	return 0;
}