Buggy python submission (verdict: Time Limit Exceeded):
N,M = map(int,input().split())
ALL = set([])
Graph = [[] for _ in range(N)]
#gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  #gyaku[b].add(a)
  ALL.add(b)
#print(Graph,gyaku)
for i in range(N):
  if i not in ALL:
    root = i
    break

used = [0 for _ in range(N)]
used[root] +=1
ans = [0 for _ in range(N)]
Q = [root]
while Q:
  v = Q.pop()
  #print(v,Q,used[v])
  if used[v] > 1:
    used[v] -=1
    continue
  used[v] -=1
  #print(v,Q)
  for w in Graph[v]:
    ans[w] = v+1
    used[w] += 1
    Q.append(w)
for x in ans:
  print(x)
  


Fixed submission:
import sys
sys.setrecursionlimit(10**7)
N,M = map(int,input().split())
ALL = [i for i in range(N)]
ALL = set(ALL)
Graph = [[] for _ in range(N)]
gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  gyaku[b].add(a)
  ALL.discard(b)
#print(Graph,gyaku)
ALL = list(ALL);root = ALL[0]

used = set([])
TS = []
def dfs(v):
  if v in used:
    return
  used.add(v)
  for w in Graph[v]:
    if w in used:
      continue
    dfs(w)
    TS.append(w)
    
dfs(root)
TS.append(root)
TS.reverse()
#print(TS)
ans = [0 for _ in range(N)]
for i in range(N):
  now = TS[i]
  for nxt in Graph[now]:
    ans[nxt] = now+1
    
for x in ans:
  print(x)

Buggy python submission (verdict: Time Limit Exceeded):
N,M = map(int,input().split())
ALL = set([])
Graph = [[] for _ in range(N)]
#gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  #gyaku[b].add(a)
  ALL.add(b)
#print(Graph,gyaku)
for i in range(N):
  if i not in ALL:
    root = i
    break

ans = [0 for _ in range(N)]
Q = [root]
while Q:
  v = Q.pop()
  for w in Graph[v]:
    ans[w] = v+1
    Q.append(w)
for x in ans:
  print(x)
  


Fixed submission:
import sys
sys.setrecursionlimit(10**7)
N,M = map(int,input().split())
ALL = [i for i in range(N)]
ALL = set(ALL)
Graph = [[] for _ in range(N)]
gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  gyaku[b].add(a)
  ALL.discard(b)
#print(Graph,gyaku)
ALL = list(ALL);root = ALL[0]

used = set([])
TS = []
def dfs(v):
  if v in used:
    return
  used.add(v)
  for w in Graph[v]:
    if w in used:
      continue
    dfs(w)
    TS.append(w)
    
dfs(root)
TS.append(root)
TS.reverse()
#print(TS)
ans = [0 for _ in range(N)]
for i in range(N):
  now = TS[i]
  for nxt in Graph[now]:
    ans[nxt] = now+1
    
for x in ans:
  print(x)

Buggy python submission (verdict: Time Limit Exceeded):
N,M = map(int,input().split())
ALL = [i for i in range(N)]
ALL = set(ALL)
Graph = [[] for _ in range(N)]
gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  gyaku[b].add(a)
  ALL.discard(b)
#print(Graph,gyaku)
ALL = list(ALL);root = ALL[0]

used = set([])
ans = [0 for _ in range(N)]
Q = [root]
while Q:
  v = Q.pop()
  for w in Graph[v]:
    ans[w] = v+1
    Q.append(w)
for x in ans:
  print(x)
  


Fixed submission:
import sys
sys.setrecursionlimit(10**7)
N,M = map(int,input().split())
ALL = [i for i in range(N)]
ALL = set(ALL)
Graph = [[] for _ in range(N)]
gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  gyaku[b].add(a)
  ALL.discard(b)
#print(Graph,gyaku)
ALL = list(ALL);root = ALL[0]

used = set([])
TS = []
def dfs(v):
  if v in used:
    return
  used.add(v)
  for w in Graph[v]:
    if w in used:
      continue
    dfs(w)
    TS.append(w)
    
dfs(root)
TS.append(root)
TS.reverse()
#print(TS)
ans = [0 for _ in range(N)]
for i in range(N):
  now = TS[i]
  for nxt in Graph[now]:
    ans[nxt] = now+1
    
for x in ans:
  print(x)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**7)
N,M = map(int,input().split())
ALL = [i for i in range(N)]
ALL = set(ALL)
Graph = [[] for _ in range(N)]
gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  gyaku[b].add(a)
  ALL.discard(b)
#print(Graph,gyaku)
ALL = list(ALL);root = ALL[0]

used = set([])
TS = []
def dfs(v):
  if v in used:
    return
  used.add(v)
  for w in Graph[v]:
    if w in used:
      continue
    dfs(w)
    TS.append(w)
    
dfs(root)
TS.append(root)
#TS.reverse()
#print(TS)
ans = [0 for _ in range(N)]
for i in range(N):
  now = TS[i]
  for j in range(i+1,N):
    #print(now,TS[j],gyaku[now])
    if TS[j] in gyaku[now]:
      ans[now] = TS[j]+1 #1index
      break
for x in ans:
  print(x)

Fixed submission:
import sys
sys.setrecursionlimit(10**7)
N,M = map(int,input().split())
ALL = [i for i in range(N)]
ALL = set(ALL)
Graph = [[] for _ in range(N)]
gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  gyaku[b].add(a)
  ALL.discard(b)
#print(Graph,gyaku)
ALL = list(ALL);root = ALL[0]

used = set([])
TS = []
def dfs(v):
  if v in used:
    return
  used.add(v)
  for w in Graph[v]:
    if w in used:
      continue
    dfs(w)
    TS.append(w)
    
dfs(root)
TS.append(root)
TS.reverse()
#print(TS)
ans = [0 for _ in range(N)]
for i in range(N):
  now = TS[i]
  for nxt in Graph[now]:
    ans[nxt] = now+1
    
for x in ans:
  print(x)

Buggy python submission (verdict: Runtime Error):
N,M = map(int,input().split())
ALL = [i for i in range(N)]
ALL = set(ALL)
Graph = [[] for _ in range(N)]
gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  gyaku[b].add(a)
  ALL.discard(b)
#print(Graph,gyaku)
ALL = list(ALL);root = ALL[0]

used = set([])
TS = []
def dfs(v):
  if v in used:
    return
  used.add(v)
  for w in Graph[v]:
    if w in used:
      continue
    dfs(w)
    TS.append(w)
    
dfs(root)
TS.append(root)
#TS.reverse()
#print(TS)
ans = [0 for _ in range(N)]
for i in range(N):
  now = TS[i]
  for j in range(i+1,N):
    #print(now,TS[j],gyaku[now])
    if TS[j] in gyaku[now]:
      ans[now] = TS[j]+1 #1index
      break
for x in ans:
  print(x)

Fixed submission:
import sys
sys.setrecursionlimit(10**7)
N,M = map(int,input().split())
ALL = [i for i in range(N)]
ALL = set(ALL)
Graph = [[] for _ in range(N)]
gyaku = [set([]) for _ in range(N)]
for i in range(N-1+M):
  a,b = map(int,input().split())
  a-=1;b-=1
  Graph[a].append(b)
  gyaku[b].add(a)
  ALL.discard(b)
#print(Graph,gyaku)
ALL = list(ALL);root = ALL[0]

used = set([])
TS = []
def dfs(v):
  if v in used:
    return
  used.add(v)
  for w in Graph[v]:
    if w in used:
      continue
    dfs(w)
    TS.append(w)
    
dfs(root)
TS.append(root)
TS.reverse()
#print(TS)
ans = [0 for _ in range(N)]
for i in range(N):
  now = TS[i]
  for nxt in Graph[now]:
    ans[nxt] = now+1
    
for x in ans:
  print(x)