#include<iostream> using namespace std; int main(){ int n; cin>>n; int ge=n%10; int shi=n/10%10; int bai=n/100%10; int qian=n/1000%10; int s=ge*1000+shi*100+bai*10+qian; if(n>s) cout<<n-s; else cout<<s-n; return 0; }