Solve the question
// keep this function call here
console.log('Sample test passing: ' + (ShortestPath(["5", "AA", "B", "C", "D", "F", "AA-B", "AA-C", "B-C", "C-D", "D-F"]) == 'A-C-D-F'));
console.log('Sample test passing: ' + (ShortestPath(["4", "X", "Y", "Z", "W", "X-Y", "Y-Z", "X-W"]) == 'X-W'));