#include
using namespace std;
void GenerateString(char *input,char output,int i , int j)
{
if(input[i] == ‘\0’)
{
output[j] = ‘\0’;
cout<<output<<", ";
return ;
}
int fd = input[i] - ‘0’;
char ch = ‘a’+fd -1;
output[j] = ch ;
GenerateString(input,output,i+1,j+1);
if(input[i+1]!= ‘\0’)
{
int sd = input[i+1]-‘0’;
int no = 10fd+sd;
if(no <=26)
{
char ch = ‘a’+no -1;
output[j] = ch;
GenerateString(input,output,i+2,j+1);
}
}
}
int main()
{
char input[100];
cin>>input;
char output[100];
GenerateString(input,output,0,0);
return 0;
}