#include<bits/stdc++.h>
using namespace std;
vector<long long> vec[10010];
long long A[10010]; 
int main(){
	int n;
	cin >> n;
	for (int i = 1; i <= n ; i++){
		cin >> A[i];
	}
	for (int i = 1; i <= n; i ++){
		int sum = 0;
		long long t = A[i];
		while(t){
			sum += t % 10;
			t /= 10;
		}
		vec[sum].push_back(A[i]);
	}
	int maxx = -1;//记录的是最多人数的组是多少
	int maxid = -1;//记录最多人数的组的编号是多少 
	for (int i = 1; i <= 81; i ++){
		//cout << vec[i].size() << endl;
		if(maxx < (int)vec[i].size()){
			maxx = vec[i].size();
			maxid = i;
		//	cout << "t" << endl;
		}
	}
	//cout << maxx << " " << maxid;
	cout << maxid << endl;
	sort(vec[maxid].begin(), vec[maxid].end(), greater<long long>());
	for (int i = 0; i < vec[maxid].size(); i ++){
		cout << vec[maxid][i] << " ";
	}
	return 0;
}