#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int main() {
    string s;
    cin >> s;
//    ll lens = s.size();
    string ans = "";
    char t = s[0];
    ll cnt = 0;
    for (int i = 0; i < s.size(); i++) {
        if (i - 1 >= 0 && s[i] != t) {
            ans += t;
            ans += to_string(cnt);
            cnt = 0;
        }
        t = s[i];
        cnt++;
    }
    ans += t;
    ans += to_string(cnt);

    cout << ans << endl;
    return 0;
}

#include<cstdio>
#include<iostream>
using namespace std;

int main(){
	
	string s;
	cin>>s;
	int len=s.length();
	char now=s[0];
	int count=1;
	
	for(int i=1;i<len;++i){
		if(s[i]==s[i-1]){
			count++;
		}
		else{
			cout<<now<<count;
			count=1;
			now=s[i];
		}
	}
	
	cout<<now<<count;

	return 0;
}

s = input()
n = len(s)
t = 1
ans = 0
for i in range(n-1):
    if s[i]==s[i+1]:
        t+=1
    else:
        print(s[i],end = "")
        print(t,end = "")
        t=1
print(s[i+1],end = "")
print(t,end = "")

#include<bits/stdc++.h>
using namespace std;
string s;
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>s;
    for(int i=0;i<s.size();){
        int ans=1;
        int j=i+1;
        while(s[j]==s[i]){
            ans++;
            j++;
        }
            cout<<s[i]<<ans;
            i=j;
    }
}