#include<iostream>
#include<string>
#include<set>
using namespace std;
char arr[] = {'0', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y','Z'};
set<string> se;
void print(int * a, int n, int pos, string s ){

    if(pos > n){
        // cout<<"Ret 1"<<endl;
        return;
    }

    if(pos == n-1){
        string newstr = s;
        // cout<<"Ret 2"<<endl;
        if(a[pos]< 27 && a[pos]>=1){
        // {   cout<<"Ret 3"<<endl;
            newstr += arr[a[pos]];
            cout<<newstr<<endl;
            se.insert(newstr);

        }
        return;
    }

    if(pos >= n-2){
        // cout<<"Ret 4"<<endl;

        if(a[pos] <= 2 && a[pos+1] < 7){
            // cout<<"Ret 5"<<endl;
            string newstr = s;
            int num = a[pos]*10 + a[pos+1];
            newstr += arr[num];
            cout<<newstr<<endl;
            se.insert(newstr);
        }
        string newstr = s;
        //as that . is already computed above
        if(a[pos] == 0 || a[pos+1] == 0){
            // cout<<"Ret 6"<<endl;
            return;
        }

        newstr += arr[a[pos]];
        newstr += arr[a[pos+1]];
        // cout<<"Ret 7"<<endl;
        cout<<newstr<<endl;

        se.insert(newstr);
        return;
    }
    if(pos < n - 2 && a[pos]<=2 && a[pos+1]<7){
        // cout<<"Ret 8"<<endl;
        string newstr = s;
        int num = a[pos]*10 + a[pos+1];
        newstr += arr[num];
        // cout<<newstr<<endl;
        print(a, n, pos+2, newstr);

    }

    s += arr[a[pos]];
    // cout<<"Bottom"<<endl;  // cout<<s<<endl;

    if(pos == n-1){
        // cout<<"Ret 10"<<endl;
        cout<<s<<endl;

        se.insert(s);
        return;
    }


    print(a, n, pos+1, s);
    return;
}

int main(){
    string s;
    cin>>s;

    int n = s.length();
    int a[s.length()];

    for(int i = 0; i < n; i++){
        a[i] = s[i] - '0';
      //  cout<<a[i]<<endl;
    }

    print(a, n, 0, "");
    // Problem : These line below are giving many errors don't know why
    // set <int > :: iterator itr;
    // for (itr = se.begin(); itr != se.end(); ++itr)
    // {
    //     cout  << *itr<<endl;
    // }
    return 0;
}