A. Chewbaсca and Number【1200 / 贪心】

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;
}