#include using namespace std; string canConstruct(vector a) { int sum=0; string s; int n=a.size(); for(int i=0;i> t; for(int a0 = 0; a0 < t; a0++){ int n; cin >> n; vector a(n); for(int a_i = 0; a_i < n; a_i++){ cin >> a[a_i];} string result = canConstruct(a); cout << result << endl; } return 0; }