Submission #2383679

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Source Code Expand

#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
#include<vector>
#include<functional>
#include<iomanip>
#include<cmath>
#include<queue>
#include<limits>
#include<cassert>
#include<set>
#include<tuple>
#include<map>
#define YES cout<<"YES"<<endl
#define NO cout<<"NO"<<endl
#define Yes cout<<"Yes"<<endl
#define No cout<<"No"<<endl
#define None cout<<"None"<<endl
typedef long long ll;
using namespace std;

int main() {
	string s; cin >> s;
	string t = "abcdefghijklmnopqrstuvwxyz";
	string u = "abcdefghijklmnopqrstuvwxyz";

	for (int i = 0; i < s.size(); ++i) {
		for (int j = 0; j < 26; ++j) {
			if (s[i] == t[j]) u[j] = 'z';
		}
	}
	sort(u.begin(),u.end());
	if (s == t) None;
	else cout << t << endl;


}

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