Problem:
Pattern Search

Find places where a R × C pattern is found within a H × W region. Print top-left coordinates (i, j) of sub-regions where the pattern found. The top-left and bottom-right coordinates of the region is (0, 0) and (H-1, W-1) respectively.

Input

In the first line, two integers H and W are given. In the following H lines, i-th lines of the region are given.

In the next line, two integers R and C are given. In the following R lines, i-th lines of the pattern are given.

output

For each sub-region found, print a coordinate i and j separated by a space character in a line. Print the coordinates in ascending order of the row numbers (i), or the column numbers (j) in case of a tie.

Constraints

1 ≤ H, W ≤ 1000

1 ≤ R, C ≤ 1000

The input consists of alphabetical characters and digits

Sample Input 1

4 5
00010
00101
00010
00100
3 2
10
01
10

Sample Output 1

0 3
1 2

Solution in Ruby (judge verdict: Time Limit Exceeded)

h, w = gets.split.map(&:to_i)
hw = []
h.times{|i|
  hw[i] = gets.chomp
}
r, c = gets.split.map(&:to_i)
rc = []
r.times{|i|
  rc[i] = gets.chomp
}
template = rc.join
hash = {}
hash[template] = true
exit if r > h || c > w

0.upto(h-r){|i|
  offset = 0
  loop do
    j = hw[i].index(rc[0], offset)
    break if j == nil
    offset = j+1
    candidate = ""
    0.upto(r-1){|k|
      candidate << hw[i+k][j,c]
    }
    puts "#{i} #{j}" if hash[candidate]
  end
}