#include <stdio.h>

int main()
{   		
		char number[1000010];
		for(int i=0; i < 1000010; i++) {
			 number[i] = '7';
		}
		while (scanf("%s",number)) {		
			int idx=0;
			while(number[idx] != '7'){
				idx++;
			}
			idx -= 2;

			if (number[0] == '0' && number[1] == '7') {
				printf("%d\n",1);
				continue;
			}
			/*line = "00" + line;*/
			bool ok = false;

			bool add11 = false;
			bool even = true;
			while (!ok) {
				if(idx < 0){
					if(number[0] == '0'){
						add11 = true;
					}
					break;
				}
				
				if (even) {
					if (number[idx] == '0') {
						number[idx] = '1';
						ok = true;
					} else {
						number[idx] = '0';
					}
				} else {
					if (number[idx] == '0') {
						number[idx] = '1';
					} else {
						number[idx] = '0';
						ok = true;
					}
				}
				idx--;
				even = !even;
			}

			int oneIdx=0;
			while(oneIdx < 1000010 && number[oneIdx] != '1' && !add11){
				if(number[oneIdx] == '7') {
					oneIdx = 1000009;
				}
				oneIdx++;
			}

			if(oneIdx == 1000010){
				printf("%d\n",0);
				continue;
			}

			if(add11) {
				printf("11");
			} 
			int f = 0;
			while(number[f] != '7'){
				printf("%c",number[f]);
				f++;
			}
			printf("\n");
			//vynulovanie pola
			for(int i=0; i < 1000010; i++) {
				number[i] = '7';
			}
		}
	return 0;
}