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from __future__ import print_function

# n - no of nodes, m - no of edges

n, m = list(map(int,raw_input().split()))

g = [[] for i in range(n)] #graph

r = [[] for i in range(n)] #reversed graph

# input graph data (edges)

for i in range(m):

u, v = list(map(int,raw_input().split()))

g[u].append(v)

r[v].append(u)

stack = []

visit = [False]*n

scc = []

component = []

def dfs(u):

global g, r, scc, component, visit, stack

if visit[u]: return

visit[u] = True

for v in g[u]:

dfs(v)

stack.append(u)

def dfs2(u):

global g, r, scc, component, visit, stack

if visit[u]: return

visit[u] = True

component.append(u)

for v in r[u]:

dfs2(v)

def kosaraju():

global g, r, scc, component, visit, stack

for i in range(n):

dfs(i)

visit = [False]*n

for i in stack[::-1]:

if visit[i]: continue

component = []

dfs2(i)

scc.append(component)

return scc

print(kosaraju())

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