#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
if A.zero?
    (H-B).times do|i|
        puts [[0]*W].join("")
    end
    B.times do|i|
        puts [[1]*W].join("")
    end
    exit
elsif B.zero?
    H.times do|i|
        puts [[0]*A+[1]*(W-A)].join("")
    end
    exit
elsif (W%A).zero? and (H%B).zero? and W/A==H/B
    H.times do|i|
        ans=array(W,0)
        A.times do|j|
          ans[(j+A*i)%W]=1
        end
        puts ans.join("")
    end
    exit
end
ans=array(W,0,H)
H.times do|i|
    A.times do|j|
        ans[i][(j+(A==B ? 1 : (A-B).abs)*i)%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