#include<bits/stdc++.h> using namespace std; int main(){ int n,a,b,c,d,x,s; cin>>n; a=n%10; b=n/10%10; c=n/100%10; d=n/1000; x=a*1000+b*100+c*10+d; s=n-x; cout<<s; return 0; } /************************************************************** Problem: 1702 User: tangkaixuan Language: C++ Result: Accepted Time:8 ms Memory:2072 kb ****************************************************************/