Problem3468--Ksusha the Squirrel

3468: Ksusha the Squirrel

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Time Limit : 2.000 sec  Memory Limit : 256 MiB

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Description

time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

Ksusha the Squirrel is standing at the beginning of a straight road, divided into n sectors. The sectors are numbered 1 to n, from left to right. Initially, Ksusha stands in sector 1.

Ksusha wants to walk to the end of the road, that is, get to sector n. Unfortunately, there are some rocks on the road. We know that Ksusha hates rocks, so she doesn't want to stand in sectors that have rocks.

Ksusha the squirrel keeps fit. She can jump from sector i to any of the sectors i+1,i+2,...,i+k.

Help Ksusha! Given the road description, say if she can reach the end of the road (note, she cannot stand on a rock)?

Input

The first line contains two integers n and k (2≤n≤3·105,1≤k≤3·105). The next line contains n characters − the description of the road: the i-th character equals ".", if the i-th sector contains no rocks. Otherwise, it equals "#".

It is guaranteed that the first and the last characters equal ".".

Output

Print "YES" (without the quotes) if Ksusha can reach the end of the road, otherwise print "NO" (without the quotes).

Examples
Input
2 1
..
Output
YES
Input
5 2
.#.#.
Output
YES
Input
7 3
.#.###.
Output
NO

Source/Category

 
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