#include <iostream>
using namespace std;
int main() {
string s;
cin>>s;
int x=s.length();
int j=0;
for(j=0;j<x;j++){
char ch=s[j];
int count =1;
for(int i=0;i<x;i++){
if(ch==s[i+1]){
count=count+1;
}
else {
j=j+count;
}
}
cout<<ch<<count;
}
return 0;
}
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