// 8:13
// 8:24
#include <iostream>
#include <ctype.h>
#include <fstream>
#include <string>

ifstream input;

void DO_DDS(char inch) {

    char ch;
    string str="";
    bool leaf=true;

//    cout << "Top of DO_DDS "<< inch << endl;
    input.get(ch);

    while (ch != inch) {
       if (isdigit (ch)) {
          leaf = false;
	  DO_DDS(ch);
       } else {
          str = str + ch;
       }
       input.get(ch);
    }
    if (leaf) {
       cout << str;
    }
//    cout << "Bottom of DO_DDS "<< ch << endl;
}


int main () {

    char ch;

    input.open("DDS.dat");

    // keep at it until we reach the EOF.
    while (input) {
        // get a character to prime the pump
        input.get(ch);
        while ((!isdigit(ch)) && (input)) {
//	    cout << "?"<< ch << "?";
            input.get(ch);
        }

        if (!input) {
	   // end of file, bail
	   cout << endl;
	   input.close();
	   return(0);
	}
	// here so it must be a digit.
	DO_DDS(ch);
    }
    cout << endl;
    input.close();
    return(0);
}