#include<iostream>
#include<cstring>
#include<iterator>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
    int fre[26] = {0};
    string s;
    cin>>s;
    //if(s.size()>2000)exit(0);
    for(int i=0;i<s.size();i++)
    {
        fre[s[i]-'a']++;
    }
    //for(int j=0;j<26;j++)cout<<fre[j]<<" ";
    //cout<<endl;
    while(true)
    {
        int dist = static_cast<int>(distance(fre, max_element(fre, fre + 26)));
        cout<<dist<<endl;
        if(fre[dist]==0)break;
        else
        {
            char letter = static_cast<char>(dist + 'a');
            cout<<letter;
            fre[dist]=0;
        }
    }
}