#include<bits/stdc++.h>
using namespace std;
int main(){
  int i,c=0;
  char s[100];
  gets(s);
  for(i=0;i<strlen(s);i++){
  c++;
  if(s[i]!=s[i+1]){
  if(c==1) cout<<s[i];
  else cout<<c<<s[i];
  c=0;
  }
}
  return 0;
}
/**************************************************************
	Problem: 1103
	User: wtq001
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2076 kb
****************************************************************/