#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,a,b,c,d,z,g;
	cin>>x;
	a=x%10;
	b=x/10%10;
	c=x/100%10;
	d=x/1000;
	z=a*1000+b*100+c*10+d;
	if(z>x){
		cout<<z-x;
	}else{
		cout<<x-z;
	}

}

/**************************************************************
	Problem: 1702
	User: zhengzihao3
	Language: C++
	Result: Wrong Answer
****************************************************************/