MOD = 998244353
h, w, k = read_line.split.map(&.to_i)
s = Array.new(h) { read_line.chars }
dp = Array.new(h) { Array.new(w) { Array.new(k, 0i64) } }
dp[0][0][0] = 1
h.times do |i|
  w.times do |j|
    next if s[i][j] == '#'
    k.times do |l|
      if i != h - 1
        case s[i + 1][j]
        when 'o'
          if l < k - 1
            dp[i + 1][j][l + 1] += dp[i][j][l]
            dp[i + 1][j][l + 1] %= MOD
          end
        when '.'
          dp[i + 1][j][l] += dp[i][j][l]
          dp[i + 1][j][l] %= MOD
        end
      end
      if j != w - 1
        case s[i][j + 1]
        when 'o'
          if l < k - 1
            dp[i][j + 1][l + 1] += dp[i][j][l]
            dp[i][j + 1][l + 1] %= MOD
          end
        when '.'
          dp[i][j + 1][l] += dp[i][j][l]
          dp[i][j + 1][l] %= MOD
        end
      end
    end
  end
end
puts dp[h - 1][w - 1].sum % MOD