Problem:
Score : 400 points

Problem Statement

There are N squares arranged in a row, numbered 1, 2, ..., N from left to right.
You are given a string S of length N consisting of . and #. If the i-th character of S is #, Square i contains a rock; if the i-th character of S is ., Square i is empty.

In the beginning, Snuke stands on Square A, and Fnuke stands on Square B.

You can repeat the following operation any number of times:

Choose Snuke or Fnuke, and make him jump one or two squares to the right. The destination must be one of the squares, and it must not contain a rock or the other person.

You want to repeat this operation so that Snuke will stand on Square C and Fnuke will stand on Square D.

Determine whether this is possible.

Constraints

4 \leq N \leq 200\ 000

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

1 \leq A, B, C, D \leq N

Square A, B, C and D do not contain a rock.

A, B, C and D are all different.

A < B

A < C

B < D

Input

Input is given from Standard Input in the following format:

N A B C D
S

Output

Print Yes if the objective is achievable, and No if it is not.

Sample Input 1

7 1 3 6 7
.#..#..

Sample Output 1

Yes

The objective is achievable by, for example, moving the two persons as follows. (A and B represent Snuke and Fnuke, respectively.)

A#B.#..

A#.B#..

.#AB#..

.#A.#B.

.#.A#B.

.#.A#.B

.#..#AB

Sample Input 2

7 1 3 7 6
.#..#..

Sample Output 2

No

Sample Input 3

15 1 3 15 13
...#.#...#.#...

Sample Output 3

Yes

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;

class test{
  static void Main(){
    string[] num = Console.ReadLine().Split();
    string txt =Console.ReadLine()+"##";
    int len = Int32.Parse(num[0]);
    int a = Int32.Parse(num[1])-1;
    int b =Int32.Parse(num[2])-1;
    int a2 =Int32.Parse(num[3])-1;
    int b2 = Int32.Parse(num[4])-1;
    bool errflg1=false, errflg2 =false;
    while((a!=a2 && errflg1==false) || (b!=b2 && errflg2==false)){
      errflg1=errflg2=false;
      if(a!=a2){
        if(txt[a+1]=='.' && (a +1)!= b){
          a++;
        }else if(txt[a+2]=='.' && (a +2)!= b && (a+2)<=a2){
          a+=2;
        }else{
          errflg1 =true;
        }
        if(a>a2){errflg1 =true;}
      }
      if(b!=b2){
        if((a2>b2) && txt[b+1]=='.' && (b-1)==a){
          ;
        }else if(txt[b+1]=='.' && (b +1)!= a){
          b++;
        }else if(txt[b+2]=='.' && (b +2)!= a && (b+2)<=b2){
          b+=2;
        }else{errflg2=true;}
        if(b>b2){errflg2 =true;}
      }
    }
    if(a==a2 && b==b2){
      Console.Write("Yes");
    }else{
      Console.Write("No");
    }
  }
}