isdiget

#include <iostream>
#include <string>

using namespace std;

int main()
{
        string in;
        int i=0,f=1;
        cin>>in;
        while(i<in.length())
        {
                if(isdigit(in[i])!=0)
                {
                        if(isdigit(in[i+1])!=0)
                        {
                                f = (in[i]-'0')*10 + (in[i+1]-'0');
                                for(int a=1;a<f;a++)
                                cout<<in[i+2];
                        } else {
                                f = in[i]-'0';
                                for(int a=1;a<f;a++)
                                cout<<in[i+1];

                        }
                } else {
                        cout<<in[i];
                }
                i++;
        }
        cout<<endl;

}