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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("loto.in");
ofstream fout("loto.out");
int N,S,v[100000001];
int s=0;
void Read()
{fin>>N>>S;
for(int i=1;i<=N;i++)
{
fin>>v[i];
}
}
int main()
{Read();
for(int i=1;i<=100000001;i++)
{
s=s+v[i];
}
if(s==S)
{
for(int i=1;i<=N;i++)
fout<<v[i];
}
else fout<<-1;
}