#include
using namespace std;
void stringCompression(string S,int length)
{
int count =1;
cout<<S[0];
if(length==1)
{
cout<<count;
}
for (int i = 1; i < length; ++i)
{
if(S[i]==S[i-1])
{
count++;
}
else
{
cout<<count;
cout<<S[i];
count=1;
}
}
cout<<count<<endl;
}
int main()
{
string S;
cin>>S;
int length= S.length();
stringCompression(S,length);
}