Check iO - How to find friends

check_connection

def check_connection(network, first, second):
    path = {first}
    check = 0

    while (len(path) > check):
        check = len(path)
        for i in network:
            one,two = i.split("-")
            if one in path or two in path:
                path.add(one)
                path.add(second)
        else:
            return second in path