Central Computer

In a network of computers, each computer is represented as a node, and a direct communication line as an edge. Given an adjacency list and a starting computer, write a program that determines the total number of computers reachable from the starting computer. The input will consist of multiple lines where each line details a node followed by its connected nodes, ending with 'END'. The output should be the count of reachable computers. Example: Input: 1 2 3 2 4 3 4 4 5 6 END 1 Output: 4