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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
 
		int firstX;
		int firstY;
		int secondX;
		int secondY;
		boolean canContinue = false;
		int firstCl = sc.nextInt();
		int secondCl = sc.nextInt();
		String str = sc.next;
		String str1 = sc.next;
		sc.close();
		if(!(firstB < 'g' && firstB >= 'a') || !(secondB < 'g' && secondB >= 'a') || firstN == secondN){
			System.out.println(-1);
		}
		else{
			if((firstCl%2 == 0 && (str.charAt(0) == 'b' || str.charAt(0) == 'd' || str.charAt(0) == 'f' || str.charAt(0) == 'h')) && (secondCl%2 == 0 && (str1.charAt(0) == 'a' || str1.charAt(0) == 'c' || str1.charAt(0) == 'e' || str1.charAt(0) == 'h'))){
				canContinue = true;
			}
 
			if(!canContinue){
				System.out.println(-1);
			}
			else{
				firstX = firstCl;
				firstY = getCoordinate(str.charAt(0));
				secondX = secondCl;
				secondY = getCoorinate(str1.charAt(0));
				if(firstY - secondY < 0){
					int totalY = secondY - firstY;
					int totalX = secondX - firstX;
					if(totalX < 0){
						totalX = totalX * -1;
					}
					System.out.println(totalX + totalY - 1);
				}
			}
		}
	}
 
	public int getCoordinate(Char ch){
		if(ch == 'a' || ch == 'b'){
			return 0;
		}
		else if(ch == 'c' || ch == 'd'){
			return 1;
		}
		else if(ch == 'e' || ch == 'f'){
			return 2;
		}
		else if(ch == 'g' || ch == 'h'){
			return 3;
		}
	}
}

Main.java:52: error: cannot find symbol
	public int getCoordinate(Char ch){
	                         ^
  symbol:   class Char
  location: class Ideone
Main.java:21: error: cannot find symbol
		String str = sc.next;
		               ^
  symbol:   variable next
  location: variable sc of type Scanner
Main.java:22: error: cannot find symbol
		String str1 = sc.next;
		                ^
  symbol:   variable next
  location: variable sc of type Scanner
Main.java:24: error: cannot find symbol
		if(!(firstB < 'g' && firstB >= 'a') || !(secondB < 'g' && secondB >= 'a') || firstN == secondN){
		     ^
  symbol:   variable firstB
  location: class Ideone
Main.java:24: error: cannot find symbol
		if(!(firstB < 'g' && firstB >= 'a') || !(secondB < 'g' && secondB >= 'a') || firstN == secondN){
		                     ^
  symbol:   variable firstB
  location: class Ideone
Main.java:24: error: cannot find symbol
		if(!(firstB < 'g' && firstB >= 'a') || !(secondB < 'g' && secondB >= 'a') || firstN == secondN){
		                                         ^
  symbol:   variable secondB
  location: class Ideone
Main.java:24: error: cannot find symbol
		if(!(firstB < 'g' && firstB >= 'a') || !(secondB < 'g' && secondB >= 'a') || firstN == secondN){
		                                                          ^
  symbol:   variable secondB
  location: class Ideone
Main.java:24: error: cannot find symbol
		if(!(firstB < 'g' && firstB >= 'a') || !(secondB < 'g' && secondB >= 'a') || firstN == secondN){
		                                                                             ^
  symbol:   variable firstN
  location: class Ideone
Main.java:24: error: cannot find symbol
		if(!(firstB < 'g' && firstB >= 'a') || !(secondB < 'g' && secondB >= 'a') || firstN == secondN){
		                                                                                       ^
  symbol:   variable secondN
  location: class Ideone
Main.java:37: error: non-static method getCoordinate(Char) cannot be referenced from a static context
				firstY = getCoordinate(str.charAt(0));
				         ^
Main.java:39: error: cannot find symbol
				secondY = getCoorinate(str1.charAt(0));
				          ^
  symbol:   method getCoorinate(char)
  location: class Ideone
11 errors

Standard output is empty