#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <vector>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <cmath>
#include <algorithm>
#include <string>
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
int main()
{
string str;
cin >> str;
map<int,int> mymap;
sort(str.begin(), str.end());
while (next_permutation(str.begin(), str.end()))
{
int sum=0;
for(int i=0;i<str.length();i++)
{
sum=sum*10+str[i]-'0';
}
if(sum%30==0)
mymap[sum]++;
}
if(!mymap.empty())
{
map<int,int>::iterator iter;
iter=mymap.end();
iter--;
cout<<iter->first<<endl;
}
else
cout<<-1<<endl;
return 0;
}