#include <bits/stdc++.h>
using namespace std;

#define FOR(i,l,r) for(int i = (l);i < (r);i++)
#define ALL(x) (x).begin(),(x).end()
template<typename T> bool chmax(T& a,const T& b){return a < b ? (a = b,true) : false;}
template<typename T> bool chmin(T& a,const T& b){return b < a ? (a = b,true) : false;}
typedef long long ll;

int N;
string S;

int main()
{
	cin >> S;
	N = S.size();

	ll ans = 0;
	map<char,int> cnt;
	deque<bool> used(N,false);
	for(int i = N - 1;i >= 0;i--){
		if(used [i] == false && ++cnt [S [i]] == 2){
			cnt [S [i]] = 0;
			int mx = -1;
			FOR(j,0,i){
				if(used [j] == false && S [j] != '0' && S [j] != S [i] && (mx == -1 || S [j] > S [mx])){
					mx = j;
				}
			}
			if(mx == -1) continue;
			used [mx] = true;
			ans += (S [mx] - '0') * 100 + (S [i] - '0') * 11;
		}
	}

	cout << ans << endl;

	return 0;
}