Problem:
Score : 300 points

Problem Statement

There are N stones arranged in a row. Every stone is painted white or black.
A string S represents the color of the stones. The i-th stone from the left is white if the i-th character of S is ., and the stone is black if the character is #.

Takahashi wants to change the colors of some stones to black or white so that there will be no white stone immediately to the right of a black stone.
Find the minimum number of stones that needs to be recolored.

Constraints

1 \leq N \leq 2\times 10^5

S is a string of length N consisting of . and #.

Input

Input is given from Standard Input in the following format:

N
S

Output

Print the minimum number of stones that needs to be recolored.

Sample Input 1

3
#.#

Sample Output 1

1

It is enough to change the color of the first stone to white.

Sample Input 2

5
#.##.

Sample Output 2

2

Sample Input 3

9
.........

Sample Output 3

0

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;
class Main
{
	public static void main(String args[]) {
		Scanner input = new Scanner(System.in);
		
		int n;
		n = input.nextInt();
		String s;
		s = input.next();
		int answer = 0;
		for(int i = 0; i < n; i++)
		{
			if(i > 0)
			{
				if(s.charAt(i) == '.' && s.charAt(i-1) == '#')
				{
					answer+=1;
				}
			}
		}
		System.out.println(answer);
		
	}
}