#include<bits/stdc++.h> using namespace std; int main(){ string s,s1; cin>>s; for(int i=0;i<s.size();i+=2){ char c=s[i]; int r=s[i+1]-'0'; for(int j=0;j<r;j++){ s1.push_back(c); } } cout<<s1; return 0; }