#input of int(split by space)
def get_i()
  return gets.chomp.split(" ").map(&:to_i)
end
#input of float(split by space)
def get_f()
  return gets.chomp.split(" ").map(&:to_f)
end
#input of string(split by space)
def get()
  return gets.chomp.split(" ")
end
#input of string(split per one character)
def get_nsp()
  return gets.chomp.split("")
end
#yes or no decision
def yn_judge(bool,y="Yes",n="No")
  return bool ? y : n 
end
#create of array
def array(size1,init=nil,size2=-1)
  if size2==-1
      return Array.new(size1){init}
  else
      return Array.new(size2){Array.new(size1){init}}
  end
end

def max(a,b)
    return a>b ? a : b
end

def min(a,b)
    return a>b ? b : a
end

INF=Float::INFINITY

H,W,A,B=get_i
ans=array(W,0,H)
H.times do|i|
    A.times do|j|
      ans[i][(i+j)%W]=1 
    end
end
#p ans
W.times do|j|
    cnt=0
    H.times do|i|
      cnt+=1 if ans[i][j]==1
    end
    if min(cnt,H-cnt)!=B
        puts "No"
        exit
    end
end
H.times do|i|
    puts ans[i].join("")
end