#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int long long

void solve(){
	string s;
	cin >> s;
	if (s[2] > s[0]) swap(s[0],s[2]);
	cout << s << endl;
    return;
}

signed main(){
    // freopen("input.txt","r",stdin);
    ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
    int _ = 1;
    while (_--){
        solve();
    }
    return 0;
}