def g;gets.split.map(&:to_i)end
N,M,S,G=g
L=(0...N).map{[1e9]*N}
d=L.map{[]}
N.times{|i|L[i][i]=0}
M.times{
  a,b,c=g
  L[a][b]=L[b][a]=c
  d[a][b]=d[b][a]=1
}
N.times{|k|N.times{|i|N.times{|j|L[i][j]=[L[i][j],L[i][k]+L[k][j]].min}}}
ans=[s=S]
while s!=G
  ans<<s=(0...N).find{|i|(L[s][i]+L[i][G]==L[s][G])&&d[s][i]==1}
end
puts ans*" "