const val MOD = 1_000_000_007

fun main() {
    readln()
    val s = readln()
    val dp = Array(s.length + 1) { IntArray(500) }
    fun add(l1: Int, c1: Int, l2: Int, c2:Int) {
        //if (dp[l2][c2] != 0) println("($l2, $c2) -> ($l1, $c1)")
        dp[l1][c1] += dp[l2][c2]
        if (dp[l1][c1] >= MOD) dp[l1][c1] -= MOD
    }
    dp[0][0] = 1
    for (i in s.indices) {
        if (s[i] == '#') continue
        for (j in 0 until 499) {
            add(i + 1, j, i, j)
            if (i + j + 2 >= s.length || s[i + j + 2] == '.') {
                add(minOf(s.length, i + j + 2), j + 1, i, j)
            }
        }
    }
    println(dp.last().sumOf { it.toLong() } % MOD)
}

private fun readInt() = readln().toInt()
private fun readLongs() = readStrings().map { it.toLong() }
private fun readStrings() = readln().split(" ")
private fun readInts() = readStrings().map { it.toInt() }