Построение

#166 Построение
from sys import setrecursionlimit
setrecursionlimit(10**9)

def dfs (v):
    global check, edge, color
    color[v] = 1
    for i in edge[v]:
        if color[i] == 0:
            dfs(i)
        elif color[i] == 1:
            check = False
    color[v] = 2
    edge_chern.append(v)


n, m = map(int,input().split())
edge = [[] for i in range(n+1)]
for i in range(m):
    a, b = map(int,input().split())
    edge[a].append(b)
edge_chern = []
color = [ 0 for i in range(n+1)]
check = True
for i in range(1,n+1):
    if color[i] == 0:
        dfs(i)
if check:
    print('Yes')
    print(*edge_chern[::-1])
else:
    print('No')