#include<iostream>
#include<string>
#include <map>
#include <vector>
#include <sstream>
using namespace std;
int main()
{
string input;
cin>>input;
multimap<int,string> mup;
vector<string> vString;
vector<int> vCount;
string scount = "";
string temp = "";
for(int i=0; i<input.size();i++)
{
if (input[i] >= '0' && input[i] <= '9')
{
if(temp != "")
{
vString.push_back(temp);
//vCount.push_back(input[i]-'0');
scount+=input[i];
temp = "";
}
else
{
scount+=input[i];
}
}
else
{
if (scount != "")
{
stringstream ss;
ss<<scount;
int t;
ss>>t;
vCount.push_back(t);
scount = "";
}
temp += input[i];
}
}
stringstream ss;
ss<<scount;
int t;
ss>>t;
vCount.push_back(t);
for (int i=0;i<vCount.size();i++)
{
mup.insert(make_pair(vCount[i],vString[i]));
}
string result = "";
multimap<int,string>::iterator it;
for(it = mup.begin();it != mup.end();++it) {
int n = it->first;
string s = it->second;
for(int i=0; i<n; i++)
{
result+=s;
}
}
cout << result << endl;
return 0;
}
