#include<iostream>
using namespace std;


void inserare(int& n){
	int v[12];
    v[1] = n%10;
    n /= 10;
    int i = 2;
    while(n){
        if(v[i-1] > n%10){
        	v[i] = v[i-1] - n%10;
        }
        else v[i] = n%10 - v[i-1];
        v[i+1] = n%10;
        n /= 10;
      	i += 2;
    }
    for(int j = i; j>=1; j--){
    	n = n*10 + v[j];
    }
}

int main(){
	int n;	cin>>n;
	inserare(n);
	cout <<n;
}