#include <bits/stdc++.h>
using namespace std;
 
void helper(string s,string ans){
 
	if(s.length()==0){
		cout<<ans<<endl;
		return;
	}
 
	if(s[0] == '0')return;
 
	int num1 = s[0] -'0';
	char c = num1+'a'-1;
	helper(s.substr(1),ans+c);
 
	if(s.length()>=2){
		int num2 = stoi(s.substr(0,2));
	if(num2>=10 && num2<=26){
		char ch2 = num2+'a'-1;
		helper(s.substr(2),ans+ch2);
	}
 
	}
}
int main() {
    string s;
	cin>>s;
 
    helper(s,"");
	return 0;
}

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