Battle Over Cities

def solve(____):
    from collections import defaultdict
    graph = defaultdict(____)
    for e in edges.split(____):
        u, v = map(int, e.split(____))
        graph[u].append(____)
        graph[v].append(____)
    lost = int(____)
    visited = [False] * (____)
    visited[lost] = True
    count = ____
    for i in range(____, n + ____):
        if not visited[i]:
            count += ____
            stack = [i]
            visited[i] = True
            while stack:
                u = stack.pop()
                for v in graph[u]:
                    if not visited[v]:
                        visited[v] = True
                        stack.append(____)
    print(____)