https://codeforces.com/problemset/problem/514/A
#include<bits/stdc++.h> using namespace std; int main(void) { string s; cin>>s; for(int i=0;i<s.size();i++) { int a=s[i]-'0',b=9-a; if(min(a,b)==0&&!i) continue; s[i]='0'+min(a,b); } cout<<s; return 0; }