#include <iostream>
#include <algorithm> using namespace std; int main(){
int n,m;
cin >> n >> m;
if(n > (m + ) || m > (n + )* ) cout<< -;
else if( n>= m) {
for(int i = ; i < m; ++ i) cout<<"";
for(int i = m; i < n; ++ i) cout<<"";
}else if(n*>=m){
for(int i = ; i< m - n; ++ i) cout<<"";
for(int i =m-n; i < n; ++ i ) cout<< "";
}else{
for(int i = ; i < n ; ++ i) cout<<"";
for(int i = ; i< m-*n; ++ i) cout<<"";
}
cout<<endl;
}

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